Hi all,
I recently installed x2goserver (and x2goclient but this is probably not
relevant in this case) on a fresh slackware-current system.
Then, using x2goclients from other computers (other slackware64-15.0,
ubuntu20.04 and 24.04 and debian systems) I want to "fetch" a desktop from
this fresh system to one of the other client systems.
The connection seems to go through normally but I never see a desktop
window poping up. I have tried "xfce" and "fluxbox" (as a custom command)
both of which have been faithfully working in the past and in other
installations.
I used `x2goclient --debug` to invoke the session and see if there are any
meaningful messages error messages from the client side, but I have not
been able to figure out if there is anything relevant:
$ x2goclient --debug
qt5ct: using qt5ct plugin
x2go-INFO-1> "Starting X2Go Client 4.1.2.2..."
[...]
x2go-INFO-3> "Started X2Go Client."
[...]
x2go-INFO-8> "Starting connection to server: x.x.x.x:22"
[...]
x2go-DEBUG-../src/sshmasterconnection.cpp:687> User authentication OK.
[...]
x2go-DEBUG-../src/sshmasterconnection.cpp:702> Login Check - OK
x2go-DEBUG-../src/onmainwindow.cpp:2947> SSH connection established.
x2go-DEBUG-../src/onmainwindow.cpp:3374> Continue normal X2Go session
[...]
x2go-DEBUG-../src/sshprocess.cpp:387> Starting tunnel via SshProcess
object 2: "localhost":57842 -> "localhost":58842
[...]
x2go-DEBUG-../src/sshmasterconnection.cpp:2065> Executing remote: "bash
-l -c 'echo \"X2GODATABEGIN:1790db9f-7b15-48ca-9eec-7596bdb1cccf\"; export
PATH=\"/usr/local/bin:/usr/bin:/bin\";export TERM=\"dumb\"; X2GODPI=141
X2GO_XINERAMA=no x2gostartagent 800x600 adsl 16m-jpeg-9 unix-kde-depth_24
us auto 1 D startfluxbox both; echo
\"X2GODATAEND:1790db9f-7b15-48ca-9eec-7596bdb1cccf\";'"
x2go-DEBUG-../src/onmainwindow.cpp:6142> "Starting NX proxy, command:
nxproxy -S
nx/nx,options=/home/user/.x2go/S-poker-50-1768844727_stDstartfluxbox_dp24/options:50"
[...]
x2go-DEBUG-../src/onmainwindow.cpp:6618> Proxy wrote on stderr:
"\nNXPROXY - Version 3.5.99.23\n\nCopyright (c) 2001, 2011 NoMachine[...]
Info: Connecting to remote host 'localhost:58842'.\n
Info: Connected to remote proxy on FD#5.\n"
So it seems ssh connection gets established, login is OK, `nxstartagent` is
executed fine, and `nxproxy` also starts without errors. but then
2go-DEBUG-../src/sshprocess.cpp:109> New TCP connection.
x2go-DEBUG-../src/sshprocess.cpp:114> New socket: 21
x2go-DEBUG-../src/onmainwindow.cpp:11659> "Searching proxy window:
X2GO-nass-50-1768844727_stDstartfluxbox_dp24"
x2go-DEBUG-../src/onmainwindow.cpp:13278> "Searching window with title:
X2GO-nass-50-1768844727_stDstartfluxbox_dp24"
x2go-DEBUG-../src/sshmasterconnection.cpp:1977> Creating new channel.
x2go-DEBUG-../src/sshmasterconnection.cpp:1990> New
channel:0x7f5b580102e0
x2go-DEBUG-../src/sshmasterconnection.cpp:1994> Forwarding parameters:
from remote ("localhost":57842) to local ("localhost":35710)
x2go-DEBUG-../src/sshmasterconnection.cpp:2028> Temporary session port
after config file parse: 57842
x2go-DEBUG-../src/sshmasterconnection.cpp:2032> Temporary session host
after config file parse: localhost
x2go-DEBUG-../src/onmainwindow.cpp:11659> "Searching proxy window:
X2GO-nass-50-1768844727_stDstartfluxbox_dp24"
x2go-DEBUG-../src/onmainwindow.cpp:13278> "Searching window with title:
X2GO-nass-50-1768844727_stDstartfluxbox_dp24"
x2go-DEBUG-../src/onmainwindow.cpp:11659> "Searching proxy window:
X2GO-nass-50-1768844727_stDstartfluxbox_dp24"
x2go-DEBUG-../src/onmainwindow.cpp:13278> "Searching window with title:
X2GO-nass-50-1768844727_stDstartfluxbox_dp24"
x2go-DEBUG-../src/onmainwindow.cpp:11659> "Searching proxy window:
X2GO-nass-50-1768844727_stDstartfluxbox_dp24"
x2go-DEBUG-../src/onmainwindow.cpp:13278> "Searching window with title:
X2GO-nass-50-1768844727_stDstartfluxbox_dp24"
[...]
x2go-DEBUG-../src/onmainwindow.cpp:6618> Proxy wrote on stderr: "Info:
Aborting the procedure due to signal '15'.\nSession: Session terminated at
'Mon Jan 19 19:46:53 2026'.\n"
x2go-DEBUG-../src/onmainwindow.cpp:6475> Deleting Proxy.
x2go-DEBUG-../src/onmainwindow.cpp:6520> Waiting for proxy to exit.
x2go-DEBUG-../src/onmainwindow.cpp:6544> Checking exit status.
x2go-DEBUG-../src/sshprocess.cpp:199> Executing remote command via
SshProcess object 3: "x2gocmdexitmessage
nass-50-1768844727_stDstartfluxbox_dp24"
x2go-DEBUG-../src/sshprocess.cpp:213> this=SshProcess(0x55f9bbed6c50)
Running masterCon->addChannelConnection(this,
'"475b1d25-5fe0-4e44-abcc-dea30df785f1"', '"bash -l -c 'echo
\"X2GODATABEGIN:475b1d25-5fe0-4e44-abcc-dea30df785f1\"; export
PATH=\"/usr/local/bin:/usr/bin:/bin\";export TERM=\"dumb\";
x2gocmdexitmessage nass-50-1768844727_stDstartfluxbox_dp24; echo \""');
x2go-DEBUG-../src/sshmasterconnection.cpp:1810> Locking SSH channel
connection MUTEX.
x2go-DEBUG-../src/sshmasterconnection.cpp:2055>
"ssh_channel_open_forward failed": "No channel request of this type from
server"
x2go-DEBUG-../src/sshmasterconnection.cpp:2187> "ssh_channel_write
failed": "Remote channel is closed"
then it tries to resume
x2go-DEBUG-../src/sshmasterconnection.cpp:2065> Executing remote: "bash
-l -c 'echo \"X2GODATABEGIN:a6aca35a-a72c-4453-96b1-0a2e1b49dfcb\"; export
PATH=\"/usr/local/bin:/usr/bin:/bin\";export TERM=\"dumb\";
x2goresume-session nass-50-1768844727_stDstartfluxbox_dp24 800x600 adsl
16m-jpeg-9 us auto 1 both no; echo
\"X2GODATAEND:a6aca35a-a72c-4453-96b1-0a2e1b49dfcb\";'"
x2go-DEBUG-../src/sshmasterconnection.cpp:2071>
"ssh_channel_open_session failed": "Socket error: Success"
x2go-DEBUG-../src/onmainwindow.cpp:11659> "Searching proxy window:
X2GO-nass-50-1768844727_stDstartfluxbox_dp24"
x2go-DEBUG-../src/onmainwindow.cpp:13278> "Searching window with title:
X2GO-nass-50-1768844727_stDstartfluxbox_dp24"
x2go-DEBUG-../src/sshprocess.cpp:478> I/O error:
"ssh_channel_open_forward failed."" - No channel request of this type from
server" (2).
x2go-DEBUG-../src/sshprocess.cpp:478> I/O error: "ssh_channel_write
failed."" - Remote channel is closed" (2).
x2go-DEBUG-../src/sshprocess.cpp:478> I/O error:
"ssh_channel_open_session failed."" - Received SSH_MSG_DISCONNECT: 2:oclose
packet referred to nonexistent channel 0" (3).
x2go-DEBUG-../src/sshprocess.cpp:478> I/O error:
"ssh_channel_open_session failed."" - Socket error: Success" (4).
x2go-DEBUG-../src/onmainwindow.cpp:11659> "Searching proxy window:
X2GO-nass-50-1768844727_stDstartfluxbox_dp24"
x2go-DEBUG-../src/onmainwindow.cpp:13278> "Searching window with title:
X2GO-nass-50-1768844727_stDstartfluxbox_dp24"
x2go-DEBUG-../src/onmainwindow.cpp:11659> "Searching proxy window:
X2GO-nass-50-1768844727_stDstartfluxbox_dp24"
x2go-DEBUG-../src/onmainwindow.cpp:13278> "Searching window with title:
X2GO-nass-50-1768844727_stDstartfluxbox_dp24"
and afterwards I get the last 2 messages in an endless loop. No desktop
window pops up.
I am also very confused about the
"ssh_channel_open_session failed": "Socket error: Success"
I have not found any information about how to enable debug output in the
server side (only on the client side) and the current messages do not give
me a clear view as to what is wrong.
Do you have any idea which way I should look next?
Thank you in advance for your help.
