blocks|key|2650054|text|您需要将代理设置添加到Nuget.Config文件中。有关详细信息，请参阅此链接：Nuget+Config+Section+&+Nuget+Proxy+Settings。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2650055|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.nuget.org/ndocs/schema/nuget.config-file#config-section|1|http://skolima.blogspot.sg/2012/07/nuget-proxy-settings.html^0|15|K|0|1S|K|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

You need to add proxy settings into Nuget.Config file. Refer to this link for details: <a href="https://docs.nuget.org/ndocs/schema/nuget.config-file#config-section" rel="noreferrer">Nuget Config Section</a> &amp; <a href="http://skolima.blogspot.sg/2012/07/nuget-proxy-settings.html" rel="noreferrer">Nuget Proxy Settings</a>.

blocks|key|2650826|text|删除%25AppData%25\NuGet\NuGet.Config并重启VS2019对我很有效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2650827|类似于https://github.com/NuGet/Home/issues/3281|offset|length|2650828|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/NuGet/Home/issues/3281^0|0|3|15|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

Deleting the %AppData%\NuGet\NuGet.Config and restarting VS2019 worked for me.
Similar to <a href="https://github.com/NuGet/Home/issues/3281" rel="noreferrer">https://github.com/NuGet/Home/issues/3281</a>

blocks|key|110009|text|我在尝试浏览NuGet包时遇到了相同的错误，请按照以下步骤解决相同的问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|110010|1-转到%25appdata%25\NuGet\NuGet.config|offset|length|style|CODE|110011|2-验证该配置中提到的urls|110012|3-删除不需要的url|110013|4-重新启动visual+studio并检查|110014|entityMap^0|0|4|S|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@$D|R|E|S|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|T|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|U|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|V|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|O|$]]

I was getting the same error while trying to browse the NuGet Package, to resolve the same followed below step:
1- go to <code>%appdata%\NuGet\NuGet.config</code>
2- Verify the urls mentioned in that config
3- Remove the url which is not required
4- Restart visual studio and check

blocks|key|2650257|text|我在尝试通过Jenkins运行nuget.exe+(配置为服务，默认情况下使用本地系统帐户)时遇到了这个问题。我已经编辑了C:\Windows\System32\config\systemprofile\AppData\Roaming\NuGet\NuGet.Config文件，如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2650258|<?xml+version="1.0"+encoding="utf-8"?>
<configuration>
++++<config>
++++++++<add+key="http_proxy"+value="http://proxy_hostname_or_ip:3128"+/>
++++++++<add+key="https_proxy"+value="http://proxy_hostname_or_ip:3128"+/>
++++</config>

++<packageSources>
++++<add+key="nuget.org"+value="https://api.nuget.org/v3/index.json"+protocolVersion="3"+/>
++</packageSources>

</configuration>+|code-block|syntax|javascript|2650259|为了测试命令提示符是否可以通过PSTools启动|2650260|psexec+-i+-s+CMD|2650261|并在新创建的cmd窗口中实际测试运行(作为本地系统运行)：|2650262|path_to_nuget\nuget.exe+restore+"path_to_solution\theSolution.sln"|2650263|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.microsoft.com/en-us/sysinternals/downloads/pstools^0|1P|23|0|0|F|7|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|13|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|14|8|@]|D|@$9|15|A|16|1|17]]|E|$]]|$1|M|3|N|5|H|7|18|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|19|8|@]|D|@]|E|$]]|$1|Q|3|R|5|H|7|1A|8|@]|D|@]|E|$I|J]]|$1|S|3|-4|5|6|7|1B|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z]]]]

I have stumbled across this issue when trying to run nuget.exe via Jenkins (configured as a service, by default using Local System account). I have edited <code>C:\Windows\System32\config\systemprofile\AppData\Roaming\NuGet\NuGet.Config</code> file which looks like the following:

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;configuration&gt;
 &lt;config&gt;
 &lt;add key="http_proxy" value="http://proxy_hostname_or_ip:3128" /&gt;
 &lt;add key="https_proxy" value="http://proxy_hostname_or_ip:3128" /&gt;
 &lt;/config&gt;

 &lt;packageSources&gt;
 &lt;add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" /&gt;
 &lt;/packageSources&gt;

&lt;/configuration&gt; 
</code></pre>

In order to test command prompt can be started via <a href="https://docs.microsoft.com/en-us/sysinternals/downloads/pstools" rel="noreferrer">PSTools</a>:

<pre><code>psexec -i -s CMD
</code></pre>

and actual test run in the newly created cmd windows (runs as Local System):

<pre><code>path_to_nuget\nuget.exe restore "path_to_solution\theSolution.sln"
</code></pre>

blocks|key|2861454|text|去|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2861455|设置(电脑的全局设置)>网络和互联网>代理>自动代理设置>并将自动检测设置设为关闭。|2861456|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Go to 

Settings ( Global Settings of your PC ) > Network and Internet > Proxy > Automatic Proxy Setup > and set Automatically detect settings to off.

blocks|key|107883|text|简单：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|107884|Close+to+>请转至C:\Users\you\AppData\Roaming\NuGet|offset|length|style|CODE|107885|Delete+NuGet.Config|unordered-list-item|107886|
|107887|Relaunch+|107888|+VS2019|ordered-list-item|107889|关闭该文件|107890|107891|你可以走了！|107892|entityMap^0|0|D|Y|0|7|C|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@$D|10|E|11|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|12|8|@$D|13|E|14|F|G]]|9|@]|A|$]]|$1|K|3|L|5|6|7|15|8|@]|9|@]|A|$]]|$1|M|3|N|5|J|7|16|8|@]|9|@]|A|$]]|$1|O|3|P|5|Q|7|17|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|18|8|@]|9|@]|A|$]]|$1|T|3|-4|5|6|7|19|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1A|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|X|$]]

Simple :
<ol>
<li>Close VS2019</li>
<li>Go to <code>C:\Users\you\AppData\Roaming\NuGet</code></li>
<li>Delete the file <code>NuGet.Config</code></li>
<li>Relaunch VS2019</li>
</ol>
You're good to go !

blocks|key|110367|text|如果您看到以下错误，您可能需要设置您的Azure工件凭据，请参见此Github+link，您可以通过运行powershell脚本或手动安装凭据提供程序。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|110368|error+:+++Response+status+code+does+not+indicate+success:+401+(Unauthorized).|code-block|syntax|javascript|110369|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/microsoft/artifacts-credprovider#azure-artifacts-credential-provider^0|X|B|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

If you see error as follow, you may need to set up your Azure Artifacts Credential, see this <a href="https://github.com/microsoft/artifacts-credprovider#azure-artifacts-credential-provider" rel="noreferrer">Github link</a>, you could either install the credential provider by running a powershell script or manually.
<pre><code>error : Response status code does not indicate success: 401 (Unauthorized).
</code></pre>

blocks|key|107602|text|如果您收到此错误，但您没有代理服务器，您可以转到|type|unstyled|depth|inlineStyleRanges|entityRanges|data|107603|%25userprofile%25\AppData\Roaming\NuGet\NuGet.Config|code-block|syntax|javascript|107604|并注释下这几行：|107605|<config>
+++++
+++++<add+key="http_proxy"+value="host"+/>
+++++<add+key="http_proxy.user"+value="username"+/>
+++++<add+key="http_proxy.password"+value="encrypted_password"+/>
</config>|107606|它对我来说是有效的，因为我得到了那个错误，但我没有代理服务器。|107607|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

If you are getting this error, but you don't have a proxy server, you can go to

<pre><code>%userprofile%\AppData\Roaming\NuGet\NuGet.Config
</code></pre>

And comment this lines:

<pre><code>&lt;config&gt;
 &lt;!-- Proxy settings --&gt;
 &lt;add key="http_proxy" value="host" /&gt;
 &lt;add key="http_proxy.user" value="username" /&gt;
 &lt;add key="http_proxy.password" value="encrypted_password" /&gt;
&lt;/config&gt;
</code></pre>

It worked for me because I was getting that error, but I don't have a proxy server.

blocks|key|109850|text|值得注意的是，.net核心SSL身份验证存在一个可能导致此问题的错误。禁用他们最新的网络堆栈实现，为我解决了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|109851|您可以永久设置此设置，或者使用以下命令启动您的应用程序：|109852|DOTNET_SYSTEM_NET_HTTP_USESOCKETSHTTPHANDLER=0+dotnet+...|code-block|syntax|javascript|109853|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

It is worth noting that there was a bug with .net core SSL authentication that could cause this. Disabling their latest networking stack implementation, solved this issue for me.

You can set this permanently or just launch your app using:

<pre><code>DOTNET_SYSTEM_NET_HTTP_USESOCKETSHTTPHANDLER=0 dotnet ...
</code></pre>

blocks|key|109870|text|在我的情况下，它的发生是因为我没有互联网连接，它正在尝试搭建|type|unstyled|depth|inlineStyleRanges|entityRanges|data|109871|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In my case it is happened because I don’t have internet connection and it is trying to scaffolding

blocks|key|107573|text|我尝试连接到我的私有TFS服务器而不是公共的NuGet应用程序接口服务器时也遇到了类似的问题。由于某些原因，我在AD服务器和TFS服务器之间出现了问题，导致它总是返回401。NuGet配置文章显示，您可以将AD用户名和密码添加到配置文件中，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|107574|++<packageSourceCredentials>
++++++<vstsfeed>
++++++++++<add+key="Username"+value="yourname@company.com"+/>
++++++++++<add+key="Password"+value="this+is+an+encrypted+password"+>
++++++++++
++++++</vstsfeed>
++</packageSourceCredentials>|code-block|syntax|javascript|107575|这不是一个非常理想的解决方案，在我找出AD服务器的问题之前，这是一个临时的解决方案，但这应该可以解决问题。|107576|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I had a similar issue trying to connect to my private TFS server instead of the public NuGet API server. For some reason I had an issue between the AD server and the TFS server so that it would always return a 401. The NuGet config article shows that you can add your AD username and password to the config file like so:

<pre><code> &lt;packageSourceCredentials&gt;
 &lt;vstsfeed&gt;
 &lt;add key="Username" value="yourname@company.com" /&gt;
 &lt;add key="Password" value="this is an encrypted password" &gt;
 &lt;!-- add key="ClearTextPassword" value="not recommended password" --&gt;
 &lt;/vstsfeed&gt;
 &lt;/packageSourceCredentials&gt;
</code></pre>

This is not quite an ideal solution, more of a temporary one until I can figure out what the problem is with the AD server, but this should do it.

blocks|key|109920|text|该错误可能只是暂时的网络问题导致的，如果重试，则会消失。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|109921|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

The error can be caused by just temporary network issue, and disappear, if try again.

blocks|key|2650117|text|某些东西可能已经改变了你的代理设置，比如Fiddler。关闭Fiddler，然后关闭Visual+Studio并再次打开它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2650118|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Something may have change your proxy setting, like Fiddler. Close Fiddler, then close Visual Studio and open it again.

blocks|key|2862088|text|我在VS2010上使用了一个较旧的Nuget版本，默认版本为TLS1.0，可以通过更改在注册表项中配置的.Net框架使用的默认TLS版本来修复|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2862089|reg+add+HKLM\SOFTWARE\Microsoft\.NETFramework\v4.0.30319+/v+SystemDefaultTlsVersions+/t+REG_DWORD+/d+1+/f+/reg:64

reg+add+HKLM\SOFTWARE\Microsoft\.NETFramework\v4.0.30319+/v+SystemDefaultTlsVersions+/t+REG_DWORD+/d+1+/f+/reg:32|code-block|syntax|javascript|2862090|仅供参考|2862091|2862092|+NuGet.org将于6月15日永久移除对TLS1.0和1.1的支持。请确保您的系统使用TLS+1.2。|blockquote|2862093|2862094|2862095|有关TLS1.2支持的信息，请参阅此link|offset|length|2862096|entityMap|0|LINK|mutability|MUTABLE|url|https://devblogs.microsoft.com/nuget/deprecating-tls-1-0-and-1-1-on-nuget-org/^0|0|0|0|0|0|0|0|I|4|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|12|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|13|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|14|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|15|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|16|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|17|8|@]|9|@$Q|18|R|19|1|1A]]|A|$]]|$1|S|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]]]

I was using an older version of Nuget on VS2010, where it defaults to TLS 1.0
here it can be fixed by changing the default TLS version used by .Net framework which is configured in Registry keys

<pre><code>reg add HKLM\SOFTWARE\Microsoft\.NETFramework\v4.0.30319 /v SystemDefaultTlsVersions /t REG_DWORD /d 1 /f /reg:64

reg add HKLM\SOFTWARE\Microsoft\.NETFramework\v4.0.30319 /v SystemDefaultTlsVersions /t REG_DWORD /d 1 /f /reg:32
</code></pre>

FYI 

<blockquote>
 NuGet.org will permanently remove support for TLS 1.0 and 1.1 on June 15th. Please ensure that your systems use TLS 1.2.
</blockquote>

You can refer to this <a href="https://devblogs.microsoft.com/nuget/deprecating-tls-1-0-and-1-1-on-nuget-org/" rel="nofollow noreferrer">link</a> for info on TLS 1.2 support

blocks|key|110513|text|您的某个nuget源可能无法访问。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|110514|在撰写本文时，AspNetCore+(https://dotnet.myget.org/F/aspnetcore-dev/api/v3/index.json)似乎有过期的证书或已被完全删除。|offset|length|110515|​|110516|📷|atomic|110517|110518|只需将nuget源代码从您的设置中删除即可解决此问题|110519|110520|110521|110522|entityMap|0|LINK|mutability|MUTABLE|url|https://dotnet.myget.org/F/aspnetcore-dev/api/v3/index.json|1|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/720c5dca03ca9369b312e8a3990f7fc1.png|imageAlt|2|https://ask.qcloudimg.com/http-save/yehe-900000/d1abe6bcbc1aa221ff4428b8de2d9dd5.gif^0|0|J|1N|0|0|0|0|1|1|0|0|0|0|0|1|2|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|17|8|@]|9|@$D|18|E|19|1|1A]]|A|$]]|$1|F|3|G|5|6|7|1B|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|1C|8|@]|9|@$D|1D|E|1E|1|1F]]|A|$]]|$1|K|3|G|5|6|7|1G|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|1H|8|@]|9|@]|A|$]]|$1|N|3|G|5|6|7|1I|8|@]|9|@]|A|$]]|$1|O|3|I|5|J|7|1J|8|@]|9|@$D|1K|E|1L|1|1M]]|A|$]]|$1|P|3|G|5|6|7|1N|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1O|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]|Y|$5|Z|U|10|A|$11|12|13|-4]]|14|$5|Z|U|10|A|$11|15|13|-4]]]]

One of your nuget sources may be unreachable.
At the moment of writing, AspNetCore (<a href="https://dotnet.myget.org/F/aspnetcore-dev/api/v3/index.json" rel="nofollow noreferrer">https://dotnet.myget.org/F/aspnetcore-dev/api/v3/index.json</a>) seems to have an expired certificate or have been removed entirely.
<a href="https://i.stack.imgur.com/1tV7I.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/1tV7I.png" alt="Can't access the JSON file" /></a>
Simply removing the nuget source from your settings should solve this issue
<a href="https://i.stack.imgur.com/ooz3x.gif" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ooz3x.gif" alt="Removing Nuget Source from Visual Studio" /></a>

blocks|key|2650958|text|在将身份搭建到我的ASP.NET核心MVC项目时，我也遇到了同样的错误消息。由于我的连接不在代理之后，因此删除/编辑代理配置没有任何意义。我也不想删除文件或卸载PMC。当我环顾四周时，我意识到在工具-->选项-->+Nuget包管理器-->常规上有一个“清除所有NuGet缓存”按钮。按下按钮后，我必须等待一段时间才能完成操作。在那之后，我再次尝试搭建身份，但没有成功。然后我决定重启VS，瞧:)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2650959|​|2650960|📷|atomic|offset|length|2650961|2650962|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/e2a4ec437abfba0eb2582fd739d4a702.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

I had the same error message while scaffolding Identity to my ASP.NET Core MVC project. Since my connection was not behind a proxy, removing/editing proxy configurations didn't make sense. And I didn't want to delete a file or uninstall PMC either. While looking around I realized a &quot;Clear All Nuget Cache(s)&quot; button on Tools --&gt; Options --&gt; NuGet Package Manager --&gt; General. After pressing the button I had to wait for some time for the operation to complete. After that I tried to scaffold the Identity again but it didn't work. Then I decided to restart VS and voila :)
<a href="https://i.stack.imgur.com/Qxf3T.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Qxf3T.png" alt="enter image description here" /></a>

blocks|key|107499|text|某些开发环境可能既不使用浏览器也不使用代理。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|107500|一种解决方案是将包从https://dotnet.myget.org/F/dotnet-core/api/v3/index.json之类的块下载到一个共享目录，然后执行以下命令：|offset|length|style|CODE|107501|dotnet+add+package+Microsoft.AspNetCore.StaticFiles+-s+"shared+drive:\index.json"|code-block|syntax|javascript|107502|我希望这对你有用。|107503|entityMap^0|0|A|1K|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@$D|S|E|T|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|U|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Some development environment may not be using neither a browser nor a proxy. 

One solution would downloading the package from nugget such as the <code>https://dotnet.myget.org/F/dotnet-core/api/v3/index.json</code> to a shared directory then execute the following:

<pre><code>dotnet add package Microsoft.AspNetCore.StaticFiles -s "shared drive:\index.json"
</code></pre>

I hope that works for you.
&nbsp;

blocks|key|2861679|text|我使用的是VSO/Azure+DevOps。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2861680|您也可以在浏览器中直接访问提要url。您可能会得到包含如下消息的响应，这可能会使您的诊断速度更快：|2861681|The+user+does+not+have+a+license+for+the+extension+ms.feed.|offset|length|style|CODE|2861682|entityMap^0|0|0|0|1N|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|N|8|@$F|O|G|P|H|I]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

I'm using VSO/Azure DevOps.

You can also visit the feed url directly in your browser. You may end up with a response that contains a message like this, which may make your diagnosis a lot quicker:

<code>The user does not have a license for the extension ms.feed.</code>

blocks|key|110044|text|在我的例子中，我只是重新启动了docker并正常工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|110045|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In my case, I just restarted the docker and just worked.

blocks|key|2650659|text|如果使用Visual+Studio2019，如果你在devenv.exe.config中没有使用任何默认代理，只需删除"defaultproxy“部分。在VS+2017中，此部分不存在|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2650660|变化|2650661|<defaultProxy+enabled="true"+useDefaultCredentials="true">
++++<proxy+bypassonlocal="True"+proxyaddress="http://<yourproxy:port#>"/>
</defaultProxy>|code-block|syntax|javascript|2650662|至|2650663||2650664|否则，请提供适当的代理用户名和密码。|2650665|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

If using Visual Studio 2019, just delete the "defaultproxy" section if you are not using any default proxies in devenv.exe.config. in VS 2017 this section was not present

change 

<pre><code>&lt;defaultProxy enabled="true" useDefaultCredentials="true"&gt;
 &lt;proxy bypassonlocal="True" proxyaddress="http://&lt;yourproxy:port#&gt;"/&gt;
&lt;/defaultProxy&gt;
</code></pre>

to

<pre><code>&lt;!--&lt;defaultProxy enabled="true" useDefaultCredentials="true"&gt;
 &lt;proxy bypassonlocal="True" proxyaddress="http://&lt;yourproxy:port#&gt;"/&gt;
&lt;/defaultProxy&gt;--&gt;
</code></pre>

Else provide the appropriate proxy username and password.

blocks|key|2650964|text|nuget+restore+|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2650965|和|unstyled|2650966|msbuild+/t:restore|2650967|由于同样的错误，这两种方法对我都不起作用。但|2650968|dotnet+restore+|2650969|工作得很完美。试试看|2650970|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|R|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$B|C]]|$1|I|3|J|5|F|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$B|C]]|$1|M|3|N|5|F|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|F|7|W|8|@]|9|@]|A|$]]]|P|$]]

<pre><code>nuget restore 
</code></pre>
and
<pre><code>msbuild /t:restore
</code></pre>
both didn't work for me with same error. But
<pre><code>dotnet restore 
</code></pre>
worked perfect. Try that

blocks|key|2651058|text|在我的例子中，问题是我是在一个更老的基于Win7的虚拟机上构建的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2651059|我在https://github.com/NuGet/NuGetGallery/issues/8176#issuecomment-683923724上找到了这个修复：|offset|length|2651060|2651061|+nuget.org今年早些时候开始强制使用TLS1.2(并放弃了对TLS1.1和1.0的支持)。Windows+7默认禁用TLS1.2(请检查注册表中HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS+1.2\Client下的DisabledByDefault值)。要启用支持，请确保已安装更新(*)并打开支持：|blockquote|style|CODE|2651062|2651063|reg+add+HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS+1.2\Client“/v+DisabledByDefault+/t+REG_DWORD+/d+0+/f+/reg:32+reg+add+"HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS+1.2\Client”/v+DisabledByDefault+/t+REG_DWORD+/d+0+/f+/reg:64+reg+add+"HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS+1.2\Client“启用了/v的/t+1/F+Client注册表添加"HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS+1.2\Client“/v+Enabled+/t+REG_DWORD+/d+1+/f+/reg:64|2651064|2651065|提到的(*)更新是微软kb3140245：Update+for+Windows+7+(KB3140245)|2651066|我安装了更新，重新启动(根据更新的请求)，添加了这些注册表项，然后Nuget工作正常。|2651067|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/NuGet/NuGetGallery/issues/8176#issuecomment-683923724|1|http://www.catalog.update.microsoft.com/search.aspx?q=kb3140245^0|0|2|20|0|0|0|24|2H|4N|H|0|0|0|0|L|W|1|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|14|8|@]|9|@$D|15|E|16|1|17]]|A|$]]|$1|F|3|-4|5|6|7|18|8|@]|9|@]|A|$]]|$1|G|3|H|5|I|7|19|8|@$D|1A|E|1B|J|K]|$D|1C|E|1D|J|K]]|9|@]|A|$]]|$1|L|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|1F|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1H|8|@]|9|@$D|1I|E|1J|1|1K]]|A|$]]|$1|R|3|S|5|6|7|1L|8|@]|9|@]|A|$]]|$1|T|3|-4|5|6|7|1M|8|@]|9|@]|A|$]]]|U|$V|$5|W|X|Y|A|$Z|10]]|11|$5|W|X|Y|A|$Z|12]]]]

In my case, the problem was that I was building on a, older virtual machine which was based on Win7.
I found this fix from <a href="https://github.com/NuGet/NuGetGallery/issues/8176#issuecomment-683923724" rel="nofollow noreferrer">https://github.com/NuGet/NuGetGallery/issues/8176#issuecomment-683923724</a> :
<blockquote>
nuget.org started enforcing the use of TLS 1.2 (and dropped support
for TLS 1.1 and 1.0) earlier this year. Windows 7 has TLS 1.2 disabled
by default (check the <code>DisabledByDefault</code> value under
<code>HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client</code> in your registry). To enable the support, please make sure you have an update (*) installed and switch the support on:
<pre><code>reg add HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client&quot; /v DisabledByDefault /t REG_DWORD /d 0 /f /reg:32
reg add &quot;HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client&quot; /v DisabledByDefault /t REG_DWORD /d 0 /f /reg:64
reg add &quot;HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client&quot; /v Enabled /t REG_DWORD /d 1 /f /reg:32
reg add &quot;HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client&quot; /v Enabled /t REG_DWORD /d 1 /f /reg:64
</code></pre>
</blockquote>
The (*) update referred to was Microsoft kb3140245:
<a href="http://www.catalog.update.microsoft.com/search.aspx?q=kb3140245" rel="nofollow noreferrer">Update for Windows 7 (KB3140245)</a>
I installed the update, rebooted (as requested by the update), added those registry keys, and then Nuget worked fine.

blocks|key|110465|text|当我试图在Visual+Studio+2015上执行Install-Package+Modernizr时，我遇到了类似的问题。我通过以下步骤修复了问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|110466|110467|从其在线源下载程序包。|ordered-list-item|110468|从窗口转至工具/NuGet程序包管理器/程序包管理器Settings.|offset|length|style|BOLD|110469|Select+程序包源。|110470|通过单击%2B符号添加新的程序包源。通过单击...+(三重点)符号输入名称和源位置。|110471|确保只选中您刚刚添加的包源。取消选中所有其他程序包源。然后转到程序包管理器控制台并键入Install-Package+Modernizr.|CODE|110472|Visual+|110473|+2015将自动安装程序包，并在根文件夹中创建脚本和程序包文件夹。|110474|110475|我希望在安装其他包时也能使用相同的解决方案。|110476|entityMap^0|0|0|0|5|T|0|7|4|0|4|1|K|3|0|V|9|17|P|0|0|N|2|Q|3|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|12|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|13|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|14|8|@$H|15|I|16|J|K]]|9|@]|A|$]]|$1|L|3|M|5|E|7|17|8|@$H|18|I|19|J|K]]|9|@]|A|$]]|$1|N|3|O|5|E|7|1A|8|@$H|1B|I|1C|J|K]|$H|1D|I|1E|J|K]]|9|@]|A|$]]|$1|P|3|Q|5|E|7|1F|8|@$H|1G|I|1H|J|K]|$H|1I|I|1J|J|R]]|9|@]|A|$]]|$1|S|3|T|5|E|7|1K|8|@]|9|@]|A|$]]|$1|U|3|V|5|E|7|1L|8|@$H|1M|I|1N|J|K]|$H|1O|I|1P|J|K]]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|X|3|Y|5|6|7|1R|8|@]|9|@]|A|$]]|$1|Z|3|-4|5|6|7|1S|8|@]|9|@]|A|$]]]|10|$]]

I had a similar problem while trying to execute Install-Package Modernizr on Visual Studio 2015. I fixed my problem by following the below steps:
<ol>
<li>Download the package from its online source.</li>
<li>Go to Tools/NuGet Package Manager/Package Manager Settings.</li>
<li>Select Package Sources from the window.</li>
<li>Add a new package source by clicking on the + sign. Enter a name and source location by clicking on ... (triple dot) sign.</li>
<li>Make sure that only the package source that you've just added is checked. Uncheck all the other package sources.</li>
<li>Go to Package Manager Console and type <code>Install-Package Modernizr</code>.</li>
<li>Visual Studio 2015 installs the package automatically and creates Scripts and packages folders in your root folder.</li>
</ol>
I hope the same solution works while installing other packages, too.

blocks|key|107350|text|为了支持@Eddie+Chen+(here)提供的答案，我还必须将http_proxy设置添加到以下文件中：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|107351|C:\Windows\system32\config\systemprofile\AppData\Roaming\NuGet\NuGet.Config|107352|<add+key="http_proxy"+value="http://your_proxy_url:8080"+/>|code-block|syntax|javascript|107353|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/41258509/2508781^0|H|4|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

In support of the answer provided by @Eddie Chen (<a href="https://stackoverflow.com/a/41258509/2508781">here</a>) I had to add http_proxy setting to following file as well:

C:\Windows\system32\config\systemprofile\AppData\Roaming\NuGet\NuGet.Config

<pre><code>&lt;add key="http_proxy" value="http://your_proxy_url:8080" /&gt;
</code></pre>

blocks|key|107422|text|在我的Dockerfile中使用Windows+10中的docker-compose+up命令运行RUN+dotnet+restore时，我得到了同样的错误。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|107423|​|107424|📷|atomic|107425|107426|我已经尝试了互联网上提供的所有可能的解决方案，也在密切关注this+open+issue。最后，在花了8个多小时之后，通过遵循前面的步骤，我能够解决我的问题。|107427|从您的system|107428|Restart+system|unordered-list-item|107429|
|107430|Install+Docker+from+system|107431|107432|Restart|107433|107434|卸载Docker。下面是my+Docker|107435|
的版本|107436|107437|107438|107439|重新启动您的系统，启动Docker+|ordered-list-item|107440|+Windows，在Windows的搜索栏中搜索Docker。确保它正在运行。|107441|您还应该转到Services.msc并确保服务Docker+Engine和Docker+for+Windows+Service正在运行。|107442|107443|107444|107445|107446|最后，你必须从C:\Users\{Username}\AppData\Roaming\NuGet检查你的Nuget.config文件。对我来说，该文件的内容如下所示。|107447|107448|<?xml+version="1.0"+encoding="utf-8"?>+<configuration>+++<packageSources>+++++<add+key="nuget.org"+value="https://api.nuget.org/v3/index.json"+/>+++</packageSources>+++<packageRestore>+++++<add+key="enabled"+value="True"+/>+++++<add+key="automatic"+value="True"+/>+++</packageRestore>+++<bindingRedirects>+++++<add+key="skip"+value="False"+/>+++</bindingRedirects>+++<packageManagement>+++++<add+key="format"+value="0"+/>+++++<add+key="disabled"+value="False"+/>+++</packageManagement>+</configuration>|107449|希望这能有所帮助。|107450|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/c0ce62566733370d8821704c9f4faeef.png|imageAlt|1|LINK|MUTABLE|url|https://github.com/NuGet/Home/issues/5358|2|https://ask.qcloudimg.com/http-save/yehe-900000/4fadebc53b55d3f1bb2cc853d5422d61.jpeg|3|https://ask.qcloudimg.com/http-save/yehe-900000/91d263ccf9f54ac2ed827b5450674286.jpeg^0|3|A|G|A|S|H|1D|I|0|0|0|1|0|0|0|T|F|1|0|0|0|0|8|6|0|0|0|0|2|6|0|0|0|1|2|0|0|0|0|O|6|0|6|C|N|D|11|Q|0|0|0|1|3|0|0|0|7|15|0|0|0|DY|0|0^^$0|@$1|2|3|4|5|6|7|27|8|@$9|28|A|29|B|C]|$9|2A|A|2B|B|C]|$9|2C|A|2D|B|C]|$9|2E|A|2F|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|2G|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|2H|8|@]|D|@$9|2I|A|2J|1|2K]]|E|$]]|$1|K|3|G|5|6|7|2L|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|2M|8|@]|D|@$9|2N|A|2O|1|2P]]|E|$]]|$1|N|3|O|5|6|7|2Q|8|@]|D|@]|E|$]]|$1|P|3|Q|5|R|7|2R|8|@]|D|@]|E|$]]|$1|S|3|T|5|6|7|2S|8|@]|D|@]|E|$]]|$1|U|3|V|5|R|7|2T|8|@$9|2U|A|2V|B|C]]|D|@]|E|$]]|$1|W|3|T|5|6|7|2W|8|@]|D|@]|E|$]]|$1|X|3|Y|5|R|7|2X|8|@]|D|@]|E|$]]|$1|Z|3|T|5|6|7|2Y|8|@]|D|@]|E|$]]|$1|10|3|11|5|R|7|2Z|8|@$9|30|A|31|B|C]]|D|@]|E|$]]|$1|12|3|13|5|6|7|32|8|@]|D|@]|E|$]]|$1|14|3|I|5|J|7|33|8|@]|D|@$9|34|A|35|1|36]]|E|$]]|$1|15|3|G|5|6|7|37|8|@]|D|@]|E|$]]|$1|16|3|-4|5|6|7|38|8|@]|D|@]|E|$]]|$1|17|3|18|5|19|7|39|8|@]|D|@]|E|$]]|$1|1A|3|1B|5|19|7|3A|8|@$9|3B|A|3C|B|C]]|D|@]|E|$]]|$1|1C|3|1D|5|19|7|3D|8|@$9|3E|A|3F|B|C]|$9|3G|A|3H|B|C]|$9|3I|A|3J|B|C]]|D|@]|E|$]]|$1|1E|3|-4|5|6|7|3K|8|@]|D|@]|E|$]]|$1|1F|3|I|5|J|7|3L|8|@]|D|@$9|3M|A|3N|1|3O]]|E|$]]|$1|1G|3|G|5|6|7|3P|8|@]|D|@]|E|$]]|$1|1H|3|-4|5|6|7|3Q|8|@]|D|@]|E|$]]|$1|1I|3|1J|5|19|7|3R|8|@$9|3S|A|3T|B|C]]|D|@]|E|$]]|$1|1K|3|-4|5|6|7|3U|8|@]|D|@]|E|$]]|$1|1L|3|1M|5|6|7|3V|8|@$9|3W|A|3X|B|C]]|D|@]|E|$]]|$1|1N|3|1O|5|6|7|3Y|8|@]|D|@]|E|$]]|$1|1P|3|-4|5|6|7|3Z|8|@]|D|@]|E|$]]]|1Q|$1R|$5|1S|1T|1U|E|$1V|1W|1X|-4]]|1Y|$5|1Z|1T|20|E|$21|22]]|23|$5|1S|1T|1U|E|$1V|24|1X|-4]]|25|$5|1S|1T|1U|E|$1V|26|1X|-4]]]]

I was getting this same error while running <code>RUN dotnet restore</code> in my <code>Dockerfile</code> using <code>docker-compose up</code> command in <code>Windows 10</code>. 

<a href="https://i.stack.imgur.com/hw9io.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hw9io.png" alt="enter image description here"></a>

I have tried all the possible solution provided on the internet and was also keep an eye on <a href="https://github.com/NuGet/Home/issues/5358" rel="nofollow noreferrer">this open issue</a>. Finally, after spending more than 8 hours, by following the preceding steps, I was able to fix my issue.

<ol>
<li>Uninstall <code>Docker</code> from your system</li>
<li>Restart your system</li>
<li>Install <code>Docker</code> from this <a href="https://store.docker.com/editions/community/docker-ce-desktop-windows" rel="nofollow noreferrer">link</a>. Below is the version of my Docker

<a href="https://i.stack.imgur.com/3Get1.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/3Get1.jpg" alt="enter image description here"></a></li>
<li>Restart your system</li>
<li>Start Docker for Windows, search <code>Docker</code> in the search bar in Windows. Make sure it is running.</li>
<li>You should also go to <code>Services.msc</code> and make sure the services <code>Docker Engine</code> and <code>Docker for Windows Service</code> are running.

<a href="https://i.stack.imgur.com/Dr6CL.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Dr6CL.jpg" alt="enter image description here"></a></li>
<li>At last, you must check your Nuget.config file from <code>C:\Users\{Username}\AppData\Roaming\NuGet</code>. For me, the content of that file was as below.

<code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;configuration&gt;
 &lt;packageSources&gt;
 &lt;add key="nuget.org" value="https://api.nuget.org/v3/index.json" /&gt;
 &lt;/packageSources&gt;
 &lt;packageRestore&gt;
 &lt;add key="enabled" value="True" /&gt;
 &lt;add key="automatic" value="True" /&gt;
 &lt;/packageRestore&gt;
 &lt;bindingRedirects&gt;
 &lt;add key="skip" value="False" /&gt;
 &lt;/bindingRedirects&gt;
 &lt;packageManagement&gt;
 &lt;add key="format" value="0" /&gt;
 &lt;add key="disabled" value="False" /&gt;
 &lt;/packageManagement&gt;
&lt;/configuration&gt;</code>

Hope this helps.</li>
</ol>

blocks|key|107586|text|转到->+Tools+->+Extensions+->+Updates并卸载NuGet+package+manager..重新启动visual+studio并重新安装它....一切都会恢复正常|type|unstyled|depth|inlineStyleRanges|entityRanges|data|107587|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Go to -> Tools -> Extensions and Updates and uninstall NuGet package manager.. restart visual studio and reinstall it.... every thing will set to normal

blocks|key|107589|text|在我的例子中，我运行了Fiddler，这改变了我的代理设置|type|unstyled|depth|inlineStyleRanges|entityRanges|data|107590|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In my case i had had Fiddler running which had changed my proxy settings

blocks|key|2650332|text|在我的示例中，我必须在Visual+studio选项->NugetPAckageManager->+sources中添加源代码，然后重新启动visual+studio命令提示符|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2650333|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

in my case i had to add the sources in the Visual studio Options->NugetPAckageManager->sources
and then restart the visual studio command prompt

blocks|key|107508|text|我有这个错误，然后我意识到我是用我的个人Microsoft帐户登录的，而不是我的工作帐户。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|107509|希望这能有所帮助。|107510|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I had this error and then I realized I was logged in with my personal Microsoft account instead of my work account.

Hope this helps.

blocks|key|2650603|text|也许this能帮上忙|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2650604|2650605|+For+me删除位于C:\Users\YourNameHere中的.nuget文件夹此处解决了此问题。|blockquote|2650606|2650607|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/NuGet/Home/issues/2880#issuecomment-274413772^0|2|4|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]|$1|E|3|F|5|G|7|V|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|W|8|@]|9|@]|C|$]]|$1|I|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Maybe <a href="https://github.com/NuGet/Home/issues/2880#issuecomment-274413772" rel="nofollow noreferrer">this</a> helps 

<blockquote>
 For me removing the .nuget folder located in C:\Users\YourNameHere fixed the problem.
</blockquote>

blocks|key|110221|text|我正在尝试添加一个Azure工件NuGet源代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|110222|我遵循了微软的指令here，但有一个关键的疏忽。|offset|length|110223|我忘了用/v2替换/v3/index.json。|style|CODE|110224|​|110225|📷|atomic|110226|110227|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.microsoft.com/en-us/azure/devops/artifacts/nuget/nuget-exe?view=azure-devops|1|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/0f5c46b286a56ce0d8b5798c8e85d583.png|imageAlt^0|0|9|4|0|0|4|3|9|E|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|14|8|@]|9|@$D|15|E|16|1|17]]|A|$]]|$1|F|3|G|5|6|7|18|8|@$D|19|E|1A|H|I]|$D|1B|E|1C|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|1D|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|1E|8|@]|9|@$D|1F|E|1G|1|1H]]|A|$]]|$1|O|3|K|5|6|7|1I|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]]|Q|$R|$5|S|T|U|A|$V|W]]|X|$5|Y|T|Z|A|$10|11|12|-4]]]]

I was trying to add an Azure Artifacts NuGet source.

I followed Microsoft's instructions <a href="https://docs.microsoft.com/en-us/azure/devops/artifacts/nuget/nuget-exe?view=azure-devops" rel="nofollow noreferrer">here</a>, with one critical oversight.

I forgot to replace <code>/v3/index.json</code> with <code>/v2</code>.

<a href="https://i.stack.imgur.com/0kkwm.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0kkwm.png" alt="enter image description here"></a>

blocks|key|2650721|text|似乎Nuget仍然使用代理脚本地址(对于我们的VPN)，即使代理设置被禁用。我删除了脚本地址，它就可以工作了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2650722|​|2650723|📷|atomic|offset|length|2650724|2650725|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/fba9f193cfe7aaac8dd3eb28158fd0f3.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

It seems Nuget still uses the proxy script address (for our VPN) even though the proxy settings are disabled. I removed the script address and it works.

<a href="https://i.stack.imgur.com/2xjQm.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2xjQm.png" alt="enter image description here"></a>

blocks|key|107795|text|如果您在Mac上使用公司代理，只需确保您的http/https复选框已选中并应用即可。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|107796|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

If you are behind a company proxy and on Mac, just make sure your http/https checkboxes are checked and applied.

blocks|key|107631|text|设置您的PC+->网络和互联网代理->自动代理设置然后将自动检测设置设为关闭并清除脚本地址|type|unstyled|depth|inlineStyleRanges|entityRanges|data|107632|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Setting of your PC -> Network And Internet Proxy -> Automatic Proxy Setup then
set Automatically detect settings to off and clear the Script Address

blocks|key|2650783|text|安装fiddler也导致了类似的问题。卸载fiddler并从machine.config+(从框架和Framework64)中删除fiddler代理解决了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2650784|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Installing fiddler was causing me similar problem. Uninstalling fiddler and removing the fiddler proxy from the machine.config (from both Framework and Framework64) solved the problem.

blocks|key|2651024|text|我无法解决这个问题本身，但我找到了一种安装软件包的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2651025|只需直接在Package+Manager+Console中将nuget.org指定为源即可。|offset|length|style|CODE|2651026|Update-Package+-reinstall+-Source+nuget.org|code-block|syntax|javascript|2651027|entityMap^0|0|5|N|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@$D|Q|E|R|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|S|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I couldn't resolve the problem itself, but found a way to install packages.
Just specify nuget.org as a source directly in <code>Package Manager Console</code>.
<pre><code>Update-Package -reinstall -Source nuget.org
</code></pre>

blocks|key|2651036|text|转到%25appdata%25\NuGet\NuGet.config的|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2651037|ordered-list-item|2651038|2651039|2651040|修改此行：|2651041|2651042|2651043|entityMap^0|2|S|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|G|7|S|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|T|8|@]|D|@]|E|$]]|$1|I|3|-4|5|6|7|U|8|@]|D|@]|E|$]]|$1|J|3|K|5|G|7|V|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|W|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|X|8|@]|D|@]|E|$]]|$1|N|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|O|$]]

<ol>
<li>go to <code>%appdata%\NuGet\NuGet.config</code>
</li>
<li>Modify this line:
<pre><code>&lt;packageSources&gt;
 &lt;add key=&quot;Microsoft Visual Studio Offline Packages&quot; value=&quot;C:\Program Files (x86)\Microsoft SDKs\NuGetPackages\&quot; /&gt;
 &lt;add key=&quot;Package source&quot; value=&quot;https://api.nuget.org/v3/index.json&quot; /&gt;
&lt;/packageSources&gt;
</code></pre>
</li>
</ol>

blocks|key|110078|text|当我试图在本地托管的Gitlab实例中设置NuGet包时，我遇到了这个错误。该错误指示401个未经授权的代码。解决方案是使用以下命令删除有问题的来源：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|110079|nuget+source+Remove+-Name+SOURCE_NAME|code-block|syntax|javascript|110080|然后添加相同的源，但这次在命令中指定用户名和密码：|110081|nuget+source+Add+-Name+SOURCE_NAME+-Source+SOURCE_URL+-UserName+GITLAB_DEPLOY_TOKEN_USERNAME+-Password+GITLAB_DEPLOY_TOKEN|110082|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I encountered this error when trying to set up NuGet packages inside locally hosted Gitlab instance. The error indicated 401 Unauthorized code. The solution was removing offending source with:
<pre><code>nuget source Remove -Name SOURCE_NAME
</code></pre>
And then adding the same source, but this time specifying the username and password in the command:
<pre><code>nuget source Add -Name SOURCE_NAME -Source SOURCE_URL -UserName GITLAB_DEPLOY_TOKEN_USERNAME -Password GITLAB_DEPLOY_TOKEN
</code></pre>

blocks|key|110115|text|在Windows+7上测试|type|unstyled|depth|inlineStyleRanges|entityRanges|data|110116|Step1+:打开命令窗口(运行命令)步骤2:运行以下命令以启用TLS1.2支持(如果已禁用)(添加注册表项)：|110117|"HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS+1.2\Client“/v+DisabledByDefault+/t+REG_DWORD+/d+0+/f+/reg:32+reg+add+"HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS+1.2\Client”/v+DisabledByDefault+/t+REG_DWORD+/d+0+/f+/reg:64+reg+add+"HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS+1.2\Client“启用了/v的/t+1Client注册表添加"HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS+1.2\+/reg:32“/v+Enabled+/t+REG_DWORD+/d+1+/f+/reg:64|110118|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Tested on Windows 7
Step1 : Open Command window (run cmd)
Step 2: Run the following commands to enable TLS 1.2 support if it is disabled (adding REGISTRY Entries):
&quot;HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client&quot; /v DisabledByDefault /t REG_DWORD /d 0 /f /reg:32
reg add &quot;HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client&quot; /v DisabledByDefault /t REG_DWORD /d 0 /f /reg:64
reg add &quot;HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client&quot; /v Enabled /t REG_DWORD /d 1 /f /reg:32
reg add &quot;HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client&quot; /v Enabled /t REG_DWORD /d 1 /f /reg:64

blocks|key|107840|text|我尝试了这里列出的许多答案，但这些都不能解决问题。最后，我不得不去Windows的凭据管理器，删除"Windows+Credentials“下的VSCredentials_xxx条目，然后重启Visual+Studio2019。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|107841|在那之后-在下一次VS开始-+VS最终要求我提供我的代理凭据-在输入它们之后，Visual+Studio的互联网访问工作了。|107842|(似乎VS在很久以前就存储了我最初提供的代理凭据-但因为在我们公司，他们在强制执行3个月后更改了密码-凭据不再有效。)|107843|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

I tried many of the listed answers here but these didn't resolve the problem. In the end, I had to go to the credential manager in Windows and delete the VSCredentials_xxx entry under &quot;Windows Credentials&quot; and restart Visual Studio 2019.
After that - on the next VS start - VS finally asked me for my proxy credentials - and after entering them, access to the internet for Visual Studio worked.
(It seemed that VS did store my initially given proxy credentials long ago - but because in our company they have password change after 3 months enforced - the credentials were no longer valid.)

blocks|key|2651317|text|如果您是Windows用户，则可以在凭据管理器中删除或更新凭据。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2651318|在Windows+10中，转到以下路径：|2651319|控制面板→所有控制面板项目→凭据管理器|2651320|或者在“开始”菜单的“搜索窗口”部分搜索“凭据管理器”。|2651321|然后从凭据管理器中选择"Windows凭据“。|2651322|凭据管理器将在"Generic+credentials“下显示许多项目，包括outlook和GitHub存储库|2651323|你点击Git右侧的下拉箭头，它将显示编辑和删除的选项。如果删除，则下次获取或拉取时将弹出凭据。或者您可以直接在那里编辑凭据。|2651324|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|S|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|T|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|U|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|V|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|O|$]]

If you are a Windows user, you may either remove or update your credentials in Credential Manager.
In Windows 10, go to the below path:
Control Panel → All Control Panel Items → Credential Manager
Or search for &quot;credential manager&quot; in your &quot;Search Windows&quot; section in the Start menu.
Then from the Credential Manager, select &quot;Windows Credentials&quot;.
Credential Manager will show many items including your outlook and GitHub repository under &quot;Generic credentials&quot;
You click on the drop down arrow on the right side of your Git: and it will show options to edit and remove. If you remove, the credential popup will come next time when you fetch or pull. Or you can directly edit the credentials there.

blocks|key|2651353|text|在我的例子中，我失去了与Git的连接。我只是再次添加了连接，它起作用了！：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2651354|​|2651355|📷|atomic|offset|length|2651356|2651357|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/a15e264e8116aac91f884f97c1c657c9.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

In my case i lost the connection with Git. I just added the connection again and it worked!:
<a href="https://i.stack.imgur.com/7OfT5.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/7OfT5.png" alt="Connection to Team Explorer" /></a>

While trying to connect to Nuget, I'm getting the error below, and then I am unable to connect:
<blockquote>
[nuget.org] Unable to load the service index for source
<a href="https://api.nuget.org/v3/index.json" rel="noreferrer">https://api.nuget.org/v3/index.json</a>.
An error occurred while sending the request.
Unable to connect to the remote server
A connection attempt failed because the connected party did not properly respond after a period of time, or established connection
failed because connected host has failed to respond 68.232.34.200:443
</blockquote>
I am able to access <code>https://api.nuget.org/v3/index.json</code> on my browser.
This question is not a duplicate. The other answers don't solve my problem.

Nuget connection attempt failed "Unable to load the service index for source"

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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尝试连接到Nuget时，我收到以下错误，然后无法连接： nuget.org无法加载源的服务索引。发送请求时出错。无法连接到远程服务器A连接尝试失败，因为连接方在一段时间后没有正确响应，或者建立的连接失败，因为连接的主机没有响应68.232.34.200:443我可以在我的浏览器上访问https://api.nuget.org/v3/index.json。这个问题不是重复的。其他的答案都不能解决我的

问Nuget连接尝试失败"Unable to load the service index for source“
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