[X2Go-Dev] Bug#1544: x2goclient not connecting [with a provisional fix]

[Andrey Malyshev]

Package: x2goclient
Version: 4.1.2.2

x2goclient stoppped connecting to a working x2go server after some update of
the client on both Linux and Mac boxes.  Provisional fix - The offending
line is "Port 22" in the localhost section of the ~/.ssh/config file on the
client side.  Commenting out the line solves the problem on both Linux and
Mac boxes.  It seems that some parser (no idea if it is the x2goclient's or
the nxproxy's one) is doing some strange thing and gets confused, as the
error message has nothing to do to the port line.  A permanent fix would be
appreciated.

Below are the relevant part of the output from x2goclient --debug and the
content of the ~/.ssh/config file with an offending Port line in the
localhost section:

x2goclient --debug:

x2go-INFO-1> "Starting X2Go Client 4.1.2.2..."
...
x2go-DEBUG-../src/onmainwindow.cpp:6142> "Starting NX proxy, command: nxproxy -S nx/nx,options=/home/andrei/.x2go/S-andrei-50-1620380095_stRTERMINAL_dp24/options:50"
...
x2go-DEBUG-../src/onmainwindow.cpp:6618> Proxy wrote on stderr: "\nNXPROXY - Version 3.5.99.26\n\n...."
...
x2go-DEBUG-../src/sshmasterconnection.cpp:1994> Forwarding parameters: from remote ("localhost":33106) to local ("localhost":60552)
x2go-DEBUG-../src/sshmasterconnection.cpp:2028> Temporary session port after config file parse: 22
x2go-DEBUG-../src/sshmasterconnection.cpp:2032> Temporary session host after config file parse: 127.0.0.1
x2go-DEBUG-../src/sshmasterconnection.cpp:2059> New channel forwarded.
...
x2go-DEBUG-../src/onmainwindow.cpp:6618> Proxy wrote on stderr: "Loop: PANIC! Wrong version or invalid session authentication cookie.\nError: Wrong version or invalid session authentication cookie.\nSession: Terminating session at 'Fri May  7 11:34:57 2021'.\nSession: Session terminated at 'Fri May  7 11:34:57 2021'.\n"
x2go-DEBUG-../src/onmainwindow.cpp:6475> Deleting Proxy.
...

=====

~/.ssh/config

Host localhost 127.0.0.1
User *****
Hostname 127.0.0.1
Port 22
Compression no
ForwardX11 yes

=====