paramiko.ssh_exception.AuthenticationException: Authentication failed.

系统环境

centos7.2 python3.7 paramiko 2.11.0

报错如下，但是直接通过ssh是可以通过验证并连上服务器

Traceback (most recent call last):  
  File "remote_ssh.py", line 19, in <module>
    ssh.connect(host,22,'root',pkey=key,timeout=10)
  File "/usr/local/python37/lib/python3.7/site-packages/paramiko/client.py", line 446, in connect
    passphrase,
  File "/usr/local/python37/lib/python3.7/site-packages/paramiko/client.py", line 766, in _auth
    raise saved_exception
  File "/usr/local/python37/lib/python3.7/site-packages/paramiko/client.py", line 742, in _auth
    self._transport.auth_publickey(username, key)
  File "/usr/local/python37/lib/python3.7/site-packages/paramiko/transport.py", line 1635, in auth_publickey
    return self.auth_handler.wait_for_response(my_event)
  File "/usr/local/python37/lib/python3.7/site-packages/paramiko/auth_handler.py", line 259, in wait_for_response
    raise e
paramiko.ssh_exception.AuthenticationException: Authentication failed.  

• 参考文档
• https://github.com/paramiko/paramiko/issues/1961

解决方案

• 方法一： 添加 disabled_algorithms=dict(pubkeys=["rsa-sha2-512", "rsa-sha2-256"])

ssh.connect(host,22,'root',pkey=key,timeout=10,disabled_algorithms=dict(pubkeys=["rsa-sha2-512", "rsa-sha2-256"]))  

• 方法二：最后发现这台机器openssh-server版本过低

yum update openssh-server -y