域名访问不了端口

nslookup example.com

# 在Linux上检查防火墙状态
sudo iptables -L

# 开放端口
sudo iptables -A INPUT -p tcp --dport <端口号> -j ACCEPT

# 检查端口状态
sudo netstat -tuln | grep <端口号>

# 检查网络连接
ping example.com

# 跟踪路由
traceroute example.com

import socket

def check_domain_port(domain, port):
    try:
        # 解析域名
        ip = socket.gethostbyname(domain)
        print(f"Domain {domain} resolved to IP {ip}")
        
        # 尝试连接端口
        with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
            s.settimeout(5)
            s.connect((ip, port))
            print(f"Port {port} is open on {domain}")
    except socket.gaierror:
        print(f"Failed to resolve domain {domain}")
    except ConnectionRefusedError:
        print(f"Port {port} is closed or filtered on {domain}")
    except Exception as e:
        print(f"An error occurred: {e}")

# 使用示例
check_domain_port("example.com", 80)