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Channel closed.

See original GitHub issue

We have switch: EDGE-CORE ECS3510-52T When we try to connect, we see “Channel closed.”

Logs:

wssh --address='***' --port=80 --logging=debug --debug
[D 200127 16:29:51 selector_events:54] Using selector: EpollSelector
[D 200127 16:29:51 policy:29] {'autoaddpolicy': <class 'webssh.policy.AutoAddPolicy'>, 'rejectpolicy': <class 'paramiko.client.RejectPolicy'>, 'warningpolicy': <class 'paramiko.client.WarningPolicy'>}
[I 200127 16:29:51 settings:98] WarningPolicy
[I 200127 16:29:51 main:39] Listening on ***:80 (http)
[I 200127 16:30:17 web:2246] 200 GET /?hostname=10.221.185.62&username=***&password=*** (***) 3.20ms
[D 200127 16:30:17 handler:224] netloc: ***
[D 200127 16:30:17 handler:227] host: ***
[D 200127 16:30:17 handler:409] ('10.221.185.62', 22, '***', '***', None)
[I 200127 16:30:17 handler:442] Connecting to 10.221.185.62:22
[D 200127 16:30:17 transport:1819] starting thread (client mode): 0xc1684c18
[D 200127 16:30:17 transport:1819] Local version/idstring: SSH-2.0-paramiko_2.7.1
[D 200127 16:30:17 transport:1819] Remote version/idstring: SSH-1.99-SSH_0.2
[I 200127 16:30:17 transport:1819] Connected (version 1.99, client SSH_0.2)
[D 200127 16:30:17 transport:1819] kex algos:['diffie-hellman-group1-sha1'] server key:['ssh-dss'] client encrypt:['aes128-cbc', '3des-cbc', 'blowfish-cbc', 'aes192-cbc', 'aes256-cbc', 'des-cbc@ssh.com', 'des-cbc'] server encrypt:['aes128-cbc', '3des-cbc', 'blowfish-cbc', 'aes192-cbc', 'aes256-cbc', 'des-cbc@ssh.com', 'des-cbc'] client mac:['hmac-md5', 'hmac-sha1'] server mac:['hmac-md5', 'hmac-sha1'] client compress:['none'] server compress:['none'] client lang:[''] server lang:[''] kex follows?False
[D 200127 16:30:17 transport:1819] Kex agreed: diffie-hellman-group1-sha1
[D 200127 16:30:17 transport:1819] HostKey agreed: ssh-dss
[D 200127 16:30:17 transport:1819] Cipher agreed: aes128-cbc
[D 200127 16:30:17 transport:1819] MAC agreed: hmac-sha1
[D 200127 16:30:17 transport:1819] Compression agreed: none
[D 200127 16:30:17 transport:1819] kex engine KexGroup1 specified hash_algo <built-in function openssl_sha1>
[D 200127 16:30:17 transport:1819] Switch to new keys ...
[I 200127 16:30:17 handler:87] Trying password authentication
[D 200127 16:30:17 transport:1819] userauth is OK
[I 200127 16:30:18 transport:1819] Authentication (password) successful!
[D 200127 16:30:18 channel:1212] [chan 0] Max packet in: 32768 bytes
[D 200127 16:30:18 channel:1212] [chan 0] Max packet out: 32768 bytes
[D 200127 16:30:18 transport:1819] Secsh channel 0 opened.
[D 200127 16:30:18 channel:1212] [chan 0] Sesch channel 0 request ok
[D 200127 16:30:18 channel:1212] [chan 0] Sesch channel 0 request ok
[D 200127 16:30:18 channel:1212] [chan 1] Max packet in: 32768 bytes
[D 200127 16:30:18 channel:1212] [chan 1] Max packet out: 32768 bytes
[D 200127 16:30:18 transport:1819] Secsh channel 1 opened.
[D 200127 16:30:18 channel:1212] [chan 1] Sesch channel 1 request ok
[D 200127 16:30:18 channel:1212] [chan 1] EOF sent (1)
[E 200127 16:30:18 handler:505] Traceback (most recent call last):
      File "/usr/local/lib/python3.6/site-packages/webssh-1.5.0-py3.6.egg/webssh/handler.py", line 503, in post
        worker = yield future
      File "/usr/local/lib64/python3.6/site-packages/tornado-6.0.3-py3.6-linux-x86_64.egg/tornado/gen.py", line 735, in run
        value = future.result()
      File "/usr/lib64/python3.6/concurrent/futures/_base.py", line 425, in result
        return self.__get_result()
      File "/usr/lib64/python3.6/concurrent/futures/_base.py", line 384, in __get_result
        raise self._exception
      File "/usr/lib64/python3.6/concurrent/futures/thread.py", line 56, in run
        result = self.fn(*self.args, **self.kwargs)
      File "/usr/local/lib/python3.6/site-packages/webssh-1.5.0-py3.6.egg/webssh/handler.py", line 459, in ssh_connect
        worker.encoding = self.get_default_encoding(ssh)
      File "/usr/local/lib/python3.6/site-packages/webssh-1.5.0-py3.6.egg/webssh/handler.py", line 429, in get_default_encoding
        _, stdout, _ = ssh.exec_command(command, get_pty=True)
      File "/usr/local/lib/python3.6/site-packages/paramiko-2.7.1-py3.6.egg/paramiko/client.py", line 514, in exec_command
        chan.exec_command(command)
      File "/usr/local/lib/python3.6/site-packages/paramiko-2.7.1-py3.6.egg/paramiko/channel.py", line 72, in _check
        return func(self, *args, **kwds)
      File "/usr/local/lib/python3.6/site-packages/paramiko-2.7.1-py3.6.egg/paramiko/channel.py", line 257, in exec_command
        self._wait_for_event()
      File "/usr/local/lib/python3.6/site-packages/paramiko-2.7.1-py3.6.egg/paramiko/channel.py", line 1226, in _wait_for_event
        raise e
    paramiko.ssh_exception.SSHException: Channel closed.

[I 200127 16:30:18 web:2246] 200 POST /?hostname=10.221.185.62&username=***&password=*** (***) 934.57ms

Can we fix it or some workaround?

Issue Analytics

State:
Created 4 years ago
Comments:6 (4 by maintainers)

Top GitHub Comments

1reaction

huashengduncommented, Feb 13, 2020

Cool. Just added an option for specifying the default character encoding of your ssh servers. You can start the server like below,

wssh --encoding='utf-8'

1reaction

huashengduncommented, Jan 31, 2020

I guess maybe the ssh server on your device EDGE-CORE ECS3510-52T cannot handle multiple channels.

Try changing file handler.py by replacing the line worker.encoding = self.get_default_encoding(ssh) with worker.encoding = 'utf-8' to see if that change fixes it.