"Error reading SSH protocol banner" occured when trying link a remote server through a jump server

[jluxiaotao]

Like the example on the webpage of pypi, code like this below:
`from jumpssh import SSHSession

establish ssh connection between your local machine and the jump server

gateway_session = SSHSession('gateway.example.com',
... 'my_user', password='my_password').open()

from jump server, establish connection with a remote server

remote_session = gateway_session.get_remote_session('remote.example.com',
... password='my_password2')`

SSH connection between my local machine and jump server is successful established.
But when trying to establish connection with the remote server, "Error reading SSH protocol banner" occured immediately.
This Traceback to paramiko.transport._check_banner.