scp.SCPException：ser **** (100) 可能无法复制文件

Question

我不知道为什么我有时会看到这个错误消息，而其他时候 scp 却成功而没有任何问题。我该如何修复它？

Traceback (most recent call last):
  File "/usr/lib/python3.6/threading.py", line 916, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.6/threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "/home/jenkins/workspace/team-infra-networking/superloop_pull_cfgs_prod/lib/objects/basenode.py", line 117, in pull_cfgs
    self.scp_connect.scp_get_file('/var/local/ucs/config.ucs', '{}/superloop/data/{}/{}{}/{}.ucs'.format(self.get_home_directory(),self.get_subdir(scp_flag),self.get_region(),self.get_environment(),self.hostname))
  File "/usr/local/lib/python3.6/dist-packages/netmiko/scp_handler.py", line 45, in scp_get_file
    self.scp_client.get(source_file, dest_file)
  File "/usr/local/lib/python3.6/dist-packages/scp.py", line 238, in get
    self._recv_all()
  File "/usr/local/lib/python3.6/dist-packages/scp.py", line 388, in _recv_all
    raise SCPException(asunicode(msg[1:]))
scp.SCPException: ser **** (100) may not copy files (scp -f /var/local/ucs/config.ucs)

我能够通过 bash 启动常规 scp 命令，并且每次都能正常工作。