Hi,
On Di 27 Jul 2021 12:56:59 CEST, Tomáš Cerha wrote:
Dear list,
I am using the X2Go Python API to develop a custom UI for running
our applications from Windows and Linux client machines.We are now migrating to Python 3. The client now works on Linux in
Python 2 and 3 and on Windows in Python 2. I, however, can’t get it
to work in Python 3 on Windows.I see that the official PyHoca GUI for Windows is still Python 2.7
so I am curious what is the current state of X2Go migration to
Python 3 and whether there are some known issues.
The upstream PyHoca GUI still uses Python2 on distros that still have
Python2. On Debian 11, PyHoca GUI runs on Python3.
Some details of my particular problem:
I am trying to start xterm (for testing) from Windows on a Linux
server. My client starts the X2Go session, starts nxproxy, but the
xterm window doesn’t appear.The client’s log looks like this:
pytis2go[8736] (x2goclient-pylib) DEBUG: command for new session is: xterm pytis2go[8736] (x2gocontrolsession-pylib) DEBUG: executing command
on X2Go server ,,xterm Python 3'': echo
X2GODATABEGIN:dfa49ff9-eec5-11eb-80a1-080027e6e559;
PATH=/usr/local/bin:/usr/bin:/bin sh -c "echo"; echo
X2GODATAEND:dfa49ff9-eec5-11eb-80a1-080027e6e559 pytis2go[8736] (x2goguardian-pylib) DEBUG: Entering X2Go Guardian
client management loop... pytis2go[8736] (x2goproxy-pylib) DEBUG: NX3 Proxy mode is server,
cookie=2532ea9e54c10c087472bb500e715d1d, host=127.0.0.1, port=52113. pytis2go[8736] (x2goproxy-pylib) DEBUG: NX3 proxy writes session log
to
C:\Users\IEUser\.x2go\S-cerha-50-1627381881_stRxterm_dp32\session.log. pytis2go[8736] (x2goproxy-pylib) DEBUG: forking threaded subprocess:
C:\pytis2go\win_apps\nxproxy\nxproxy.exe -S
nx/nx,options=\..\S-cerha-50-1627381881_stRxterm_dp32\options:50 pytis2go[8736] (x2goproxy-pylib) DEBUG: waiting for proxy to come
up: 0.4s x 1 pytis2go[8736] (x2goproxy-pylib) DEBUG: waiting for port fw tunnel
to come up: 0.5s x 1 pytis2go[8736] (x2goguardian-pylib) DEBUG: Entering X2Go Guardian
client management loop...The session.log at this time contains:
NXPROXY - Version 3.5.0
Copyright (C) 2001, 2010 NoMachine. See http://www.nomachine.com/ for more information.
Info: Proxy running in client mode with pid '9596'. Session: Starting session at 'Tue Jul 27 03:32:06 2021'. Info: Connecting to remote host '127.0.0.1:52113'. Info: Connection to remote proxy '127.0.0.1:52113' established.
If I kill the client after some time when “nothing happens”, the
session.log contains these additional lines:Error: The remote NX proxy closed the connection. Warning: Couldn't start '/bin/true'. Error is 2 'No such file or directory'. Warning: Trying with path
'/usr/NX/bin:/opt/NX/bin:/usr/local/NX/bin:.:/cygdrive/c/pytis2go/venv/p2go3/Scripts:/cygdrive/c/Windows/system32:/cygdrive/c/Windows:/cygdrive/c/Windows/System32/Wbem:/cygdrive/c/Windows/System32/WindowsPowerShell/v1.0:/cygdrive/c/Windows/System32/OpenSSH:/cygdrive/c/ProgramData/chocolatey/bin:/cygdrive/c/Program Files/Puppet
Labs/Puppet/bin:/cygdrive/c/Users/IEUser/AppData/Local/Microsoft/WindowsApps'. Error: Failure negotiating the session in stage '7'. Error: Wrong version or invalid session authentication cookie. Session: Terminating session at 'Tue Jul 27 03:33:16 2021'. Session: Session terminated at 'Tue Jul 27 03:33:16 2021'. Warning: Couldn't start 'nxclient'. Error is 2 'No such file or directory'. Warning: Trying with path
'/usr/NX/bin:/opt/NX/bin:/usr/local/NX/bin:.:/usr/NX/bin:/opt/NX/bin:/usr/local/NX/bin:.:/cygdrive/c/pytis2go/venv/p2go3/Scripts:/cygdrive/c/Windows/system32:/cygdrive/c/Windows:/cygdrive/c/Windows/System32/Wbem:/cygdrive/c/Windows/System32/WindowsPowerShell/v1.0:/cygdrive/c/Windows/System32/OpenSSH:/cygdrive/c/ProgramData/chocolatey/bin:/cygdrive/c/Program Files/Puppet
Labs/Puppet/bin:/cygdrive/c/Users/IEUser/AppData/Local/Microsoft/WindowsApps'.The “options” file in the session directory contains:
nx/nx,retry=5,composite=1,connect=127.0.0.1,clipboard=1,cookie=2532ea9e54c10c087472bb500e715d1d,port=52113,errors=.\..\S-cerha-50-1627381881_stRxterm_dp32\session.err:50
I suppose that nxproxy.exe can not depend on the currently active
Python version, so the problem should be on the x2go Python library
side. Does anyone have any idea how to proceed? What to check or
how to further debug it?
Your problem seems to be in this session.log line:
Error: Wrong version or invalid session authentication cookie.
Thank you for any idea.
Are you sure that the user that launches nxproxy.exe can access the
local (MS Windows side) Xserver correctly?
Or, the cookie string is wrong (see options file) and differs by some
reason (X2Go client side / server side).
In nx-libs upstream sources [1], you find some testscripts that you
could modify and check if the interplay of nxproxy.exe (MSWin version)
and nxagent (on Linux / X2Go Server) play together well.
Mike
[1] https://github.com/ArcticaProject/nx-libs
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