Paramiko 问题 - 执行命令时通道关闭

我一直在尝试在 Overture Box 使用 paramiko 建立 SSH 连接.

I've been trying to run commands on an Overture Box using paramiko to establish the SSH connection.

我的脚本确实正确连接到了盒子，没有发现问题，问题出现在脚本运行 exec_command(cmd) 方法时:

My script does connect properly to the box, no issues are seen, the problem comes when the script runs the exec_command(cmd) method:

Traceback (most recent call last):
  File "test.py", line 39, in <module>
    stdin, stdout, stderr = ssh.exec_command("version")
  File "/opt/csw/lib/python2.7/site-packages/paramiko/client.py", line 345, in exec_command
    chan.exec_command(command)
  File "/opt/csw/lib/python2.7/site-packages/paramiko/channel.py", line 60, in _check
    return func(self, *args, **kwds)
  File "/opt/csw/lib/python2.7/site-packages/paramiko/channel.py", line 229, in exec_command
    self._wait_for_event()
  File "/opt/csw/lib/python2.7/site-packages/paramiko/channel.py", line 1086, in _wait_for_event
    raise e
paramiko.ssh_exception.SSHException: Channel closed.

使用 Linux Box 作为目标主机的相同脚本产生正确的结果

Same script using a Linux Box as the target host yields the proper results

代码是借来的，我刚刚在谷歌上找到了片段:

The code is borrowed, I just found the snippet Googling:

import sys
import time
import select
import paramiko

host = raw_input("Hostname?: ")
i = 1
password = raw_input("Password?: ")


#
# Try to connect to the host.
# Retry a few times if it fails.
#
while True:
    print "Trying to connect to %s (%i/30)" % (host, i)

    try:
        ssh = paramiko.SSHClient()
        ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
        ssh.connect(host, port=22, username="username", password=password)
        print "Connected to %s" % host
        break
    except paramiko.AuthenticationException:
        print "Authentication failed when connecting to %s" % host
        sys.exit(1)
    except:
        print "Could not SSH to %s, waiting for it to start" % host
        i += 1
        time.sleep(2)

    # If we could not connect within time limit
    if i == 30:
        print "Could not connect to %s. Giving up" % host
        sys.exit(1)

# Send the command (non-blocking)
stdin, stdout, stderr = ssh.exec_command("version")

# Wait for the command to terminate
while not stdout.channel.exit_status_ready():
    # Only print data if there is data to read in the channel
    if stdout.channel.recv_ready():
        rl, wl, xl = select.select([stdout.channel], [], [], 0.0)
        if len(rl) > 0:
           # Print data from stdout
            print stdout.channel.recv(1024),

#
# Disconnect from the host
#
print "Command done, closing SSH connection"
ssh.close()

我发现了其他问题，据说该问题可能与主机中的 SFTP 设置有关，但我可以这样做:

I found other questions where it's said that the issue might be related to the SFTP settings in the host, but I'm able to do:

sftp username@hostname

我已经在谷歌上搜索了一段时间，但到目前为止我找不到任何有用的东西.

I've Googled for a while but I can't find anything helpful so far.

预先感谢您的帮助.

差点忘了，我知道问题出在:

Almost forgot, I know the issue is exactly at:

stdin, stdout, stderr = ssh.exec_command("version")

我以交互方式运行了整个脚本，但在运行该行时它会中断.

I've run the whole script interactively and it breaks when I run that line.