Hi, You are using nxproxy 3 5.99.23 which should not be a problem, despite being very old. But maybe you are also using this ancient version on the server. Which IS a problem. Please ensure you use 3.5.99.26 or 27.
A quick test to rule out some things: ssh -X ro the server, then run nxagent :55. Do you see an nxagent window? Also, are you sure you have an X desktop running on the server and not wayland? And on the client? Uli Athanasios Silis <[email protected]> schrieb am Mo., 19. Jan. 2026, 19:34: > 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. > > > _______________________________________________ > x2go-user mailing list -- [email protected] > To unsubscribe send an email to [email protected] > ${mailinglist_url} (substitution broken, will need mailman upgrade) > https://lists.x2go.org/postorius/lists/x2go-user.lists.x2go.org >
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