Python Pysftp Error

Question

My code:

import pysftp 
s = pysftp.Connection(host='test.rebex.net', username='demo', password='password') 
data = s.listdir() 
s.close() 
for i in data: 
    print i

I'm getting an error trying to connect to a SFTP server using pysftp.

This should be straight forward enough but I get the error below:

Traceback (most recent call last):
  File "/Users/gavinhinfey/Documents/Python Files/sftp_test.py", line 3, in <module>
    s = pysftp.Connection(host='test.rebex.net', username='demo', password='password')
  File "build/bdist.macosx-10.6-intel/egg/pysftp.py", line 55, in __init__
  File "build/bdist.macosx-10.5-intel/egg/paramiko/transport.py", line 303, in __init__
paramiko.SSHException: Unable to connect to test.rebex.net: [Errno 60] Operation timed out
Exception AttributeError: "'Connection' object has no attribute '_tranport_live'" in <bound     method Connection.__del__ of <pysftp.Connection object at 0x101a5a810>> ignored

I've tried using different versions of python (mostly 2.7), I have all dependencies installed and I tried numerous sftp connections. I'm using OS X 10.9.1.

Journeywork

sorry the code input code is import pysftp s = pysftp.Connection(host='test.rebex.net', username='demo', password='password') data = s.listdir() s.close() for i in data: print i – Journeywork

are you sure your host is correct and your ports aren't blocked? your error log is telling you that your connection to host timed out, after which the s object is not initiated and throws normal errors for an object that failed to initiate. – Beltz

I can connect with File Zilla with the same details? Does this mean that my ports are not blocked? – Journeywork

Strange. Maybe try log=True in your kwargs for Connection and post what you get there. – Beltz

Sorry but when I add log=True where does it output the log? Thanks – Journeywork

When you use File Zilla, which protocol are you using? FTP, FTPS, or SFTP? – Rohrer

I just tried using pythons builtin ftplib and it works. It appears to be FTP not SFTP that I needed. My apologies. – Journeywork

Answer 1

That initial error appears to be a problem connecting with the remote server (SSHException). The second (AttributeError), is from a bug in the code that occurs when the connection fails. It is fixed in the latest version of pysftp

https://pypi.python.org/pypi/pysftp

pip install -U pysftp

is your friend.

Deliberative

Python 2.7's pip says: no such option: -u. – Merola

Answer 2

updating the package didn't work for me, as it was already up-to-date (latest for python 2.7 at least)

Found a better aproach here.

1) You can manualy add the ssh key to the known_hosts file

ssh test.rebex.net

2) Or you can set a flag to ignore it

import pysftp
cnopts = pysftp.CnOpts()
cnopts.hostkeys = None    # disable host key checking.
with pysftp.Connection('host', username='me',private_key=private_key,
                           private_key_pass=private_key_password,
                           cnopts=cnopts) as sftp
    # do stuff here

Sogdiana

Never use the option 2), unless you do not care about security! – Loki

Answer 3

@Martin.Prikryl: setting hostkeys = None is very useful in the initial stage of coding with pysftp. Debugging a program that keeps failing for a known exception hides other problems that need attention--like making an actual connection. I can deal with the 'man in the middle' problem later once I know my code is actually working correctly.

@All: The current pysftp.CnOpts() object appears to have a bug:

cnopts = pysftp.CnOpts()
cnopts.hostkeys = None

The above code does not prevent host key checking.

python getfile_v3.py --help Traceback (most recent call last): File "getfile_v3.py", line 9, in cnopts = pysftp.CnOpts() File "c:\Program Files\Python\Python38\lib\site-packages\pysftp_init_.py", line 64, in init raise HostKeysException('No Host Keys Found') pysftp.exceptions.HostKeysException: No Host Keys Found

The second line doesn't get executed because the first does the host key check by default. If I set the key with:

      cnopts = pysftp.CnOpts(hostkeys=None)

the same error results.

It appears that 'hostkeys' has been deprecated, and there is no way to disable the host key check.

Joe White

Autocatalysis

This answer is not answering the original question. Maybe try to do a bug report or ask another question? – Verisimilitude

Answer 4

Workaround for SSHException: No hostkey for host test.rebex.net found

just to add it manually via ssh

1. ssh [email protected]
2. it will ask for password, you need to enter "password"
3. it will show you the message

The authenticity of host 'test.rebex.net (ip-adress)' can't be established.
ECDSA key fingerprint is SHA256:OzvpQxxxV9F/ECMXbQ7B7zbKxxxxUno65c.
Are you sure you want to continue connecting (yes/no/[fingerprint])?

4. confirm action -> type "yes"
5. done, you will get a message, since now your sftp connection to 'test.rebex.net' should work

Warning: Permanently added 'test.rebex.net,ip' (ECDSA) to the list of known hosts.

Himalayas