堡垒机目标连接异常

import paramiko

# 配置堡垒机信息
bastion_host = 'bastion.example.com'
bastion_port = 22
bastion_username = 'user'
bastion_password = 'password'

# 配置目标系统信息
target_host = 'target.example.com'
target_port = 22
target_username = 'user'
target_password = 'password'

# 连接堡垒机
ssh_bastion = paramiko.SSHClient()
ssh_bastion.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh_bastion.connect(bastion_host, port=bastion_port, username=bastion_username, password=bastion_password)

# 通过堡垒机连接目标系统
transport = ssh_bastion.get_transport()
dest_addr = (target_host, target_port)
local_addr = ('localhost', 22)
channel = transport.open_channel("direct-tcpip", dest_addr, local_addr)

# 连接目标系统
ssh_target = paramiko.SSHClient()
ssh_target.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh_target.connect(target_host, port=target_port, username=target_username, password=target_password, sock=channel)

# 执行命令
stdin, stdout, stderr = ssh_target.exec_command('ls -l')
print(stdout.read().decode())

# 关闭连接
ssh_target.close()
ssh_bastion.close()