AttributeError: 'NoneType' object has no attribute 'open_session'"
Solution 1
I had the same thing. I found out it occurred when I closed my client in some previous code. I don't know if that is/was your issue but the error wasn't very informative.
Solution 2
I just hit this issue. In my case, I went into the debugger and experimented with the 'ssh' object. This is what I saw:
ipdb> ssh.connect(...omit details...)
ipdb> resp = ssh.exec_command('echo hello')
ipdb> rest[1].read() ## read from STDOUT, expected 'hello'
'' ## but, I got ''
ipdb> resp[2].read() ## read from STDERR
'WARNING: Your password has expired.\nPassword change required but no TTY available.\n'
If anyone else encounters this issue, then I would first make certain that you're not seeing an error elsewhere. In my case, it's a server account with an expired password. That issue caused a cascade of issues which manifested in the NoneType error referenced in the question.
adinanp
Updated on July 26, 2022Comments
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adinanp almost 2 years
When running the following function:
def conEnclosure(): freebay = open("freebay", "w+") ssh = paramiko.SSHClient() ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy()) password = getpass.getpass("Enter the password for infra: ") for host in open("full.json", "r"): print host ssh.connect("%s" % host, username="infra", password="%s" % password) stdin, stdout, stderr = ssh.exec_command("show server info all")
I received the following error:
Traceback (most recent call last): File "./findbay_v2.py", line 53, in <module> conEnclosure() File "./findbay_v2.py", line 41, in conEnclosure ssh.exec_command("show server info all") File "build/bdist.macosx-10.9-intel/egg/paramiko/client.py", line 364, in exec_command AttributeError: 'NoneType' object has no attribute 'open_session'
However, when running in python shell the following commands:
>>> import paramiko >>> ssh = paramiko.SSHClient() >>> ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy()) >>> ssh.connect("host", username="xxx", password="xxx") >>> stdin, stdout, stderr = ssh.exec_command("show server info all")
Everything went as expected, only when I transform it in the above function in a file.py is that the error occurs. Does anyone have any idea what it might be?