paramiko.ssh_exception.ChannelException 的根本原因：（1，'行政上禁止'）

Question

我最近一直在尝试使用 paramiko，偶尔会遇到以下错误。

我无法找出错误的根源。是不是因为我已经用完了与服务器的开放 ssh 连接数？如果是这样，我如何查看现有连接？

  File "/sw/packages/python/current/lib/python2.7/site-
  packages/paramiko/client.py", line 420, in exec_command
  chan = self._transport.open_session(timeout=timeout)
  File "/sw/packages/python/current/lib/python2.7/site-
  packages/paramiko/transport.py", line 704, in open_session
  timeout=timeout)
  File "/sw/packages/python/current/lib/python2.7/site-
  packages/paramiko/transport.py", line 836, in open_channel
  raise e
  paramiko.ssh_exception.ChannelException: (1, 'Administratively 
  prohibited')