提示连接远程服务器失败

ping <服务器IP地址>

sudo systemctl status sshd

ssh <用户名>@<服务器IP地址>

sudo ufw allow 22/tcp  # 允许SSH连接

telnet <服务器IP地址> <端口号>

nc -vz <服务器IP地址> <端口号>

import paramiko

def ssh_connect(hostname, port, username, password):
    client = paramiko.SSHClient()
    client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    try:
        client.connect(hostname, port, username=username, password=password)
        print("连接成功")
    except paramiko.AuthenticationException:
        print("认证失败")
    except paramiko.SSHException as sshException:
        print(f"SSH连接失败: {sshException}")
    except Exception as e:
        print(f"发生错误: {e}")
    finally:
        client.close()

# 使用示例
ssh_connect('example.com', 22, 'user', 'password')