Hi,
I use x2go successfully for several years and I very like it, thank you!
I have a problem with the latest x2go (http://ppa.launchpad.net/x2go/st able/ubuntu xenial main). I can login without problem to the server, working as expected, but when I do not work on the x2go session (inactive or idle), the server closes the connection and it is not possible to connect again. Before the upgrade I had open sessions for days.
Any idea? Below the technical details.
The client debug shows (short version): x2go-DEBUG-../src/sshmasterconnection.cpp:2089> Forwarding parameters: from remote ("localhost":49454) to local ("localhost":49788) x2go-DEBUG-../src/sshmasterconnection.cpp:2126> Temporary session port after config file parse: 49454 x2go-DEBUG-../src/sshmasterconnection.cpp:2130> Temporary session host after config file parse: localhost x2go-DEBUG-../src/sshmasterconnection.cpp:2160> New channel forwarded. x2go-DEBUG-../src/sshmasterconnection.cpp:2320> "ssh_channel_write failed": "Remote channel is closed" x2go-DEBUG-../src/sshprocess.cpp:472> I/O error: "ssh_channel_write failed."" - Remote channel is closed" (2). x2go-DEBUG-../src/sshmasterconnection.cpp:2363> EOF sent. x2go-DEBUG-../src/sshmasterconnection.cpp:2367> Channel closed. x2go-DEBUG-../src/onmainwindow.cpp:6459> Proxy wrote on stderr: "Loop: PANIC! The remote NX proxy closed the connection. Error: The remote NX proxy closed the connection. " x2go-DEBUG-../src/onmainwindow.cpp:6459> Proxy wrote on stderr: "Loop: PANIC! Failure negotiating the session in stage '7'. Error: Failure negotiating the session in stage '7'. Loop: PANIC! Wrong version or invalid session authentication cookie. Error: Wrong version or invalid session authentication cookie.
So, on the server side the port 49454 did not exist and even on the server I can see the session running (with ps ax), it is not possible to connect (The remote NX proxy closed the connection....))
I did not find fresh or relevant information on the net, I spent about 2 days to figure out, but without success (purge, reinstall, xsession removing etc. - all done, without results)
On the server, the sshd log contains this relevant information (it is the pair of the client debug log above): Mar 5 19:45:11 localhost sshd[19999]: Accepted publickey for xxxx from YYYYY.98 port 43002 ssh2: RSA SHA256:notrelevant Mar 5 19:45:11 localhost sshd[19999]: pam_unix(sshd:session): session opened for user username by (uid=0) Mar 5 19:45:11 localhost systemd-logind[787]: New session 9 of user username. Mar 5 19:45:22 localhost su[20438]: Successful su for username by root Mar 5 19:45:22 localhost su[20438]: + ??? root:username Mar 5 19:45:22 localhost su[20438]: pam_unix(su:session): session opened for user username by (uid=0) Mar 5 19:45:22 localhost systemd-logind[787]: New session c1 of user username. Mar 5 19:45:22 localhost su[20438]: pam_unix(su:session): session closed for user username Mar 5 19:45:22 localhost su[20492]: Successful su for username by root Mar 5 19:45:22 localhost systemd-logind[787]: Removed session c1. Mar 5 19:45:22 localhost su[20492]: + ??? root:username Mar 5 19:45:22 localhost su[20492]: pam_unix(su:session): session opened for user username by (uid=0) Mar 5 19:45:22 localhost systemd-logind[787]: New session c2 of user username. Mar 5 19:45:24 localhost su[20492]: pam_unix(su:session): session closed for user username Mar 5 19:45:24 localhost systemd-logind[787]: Removed session c2. Mar 5 19:45:25 localhost sshd[3615]: pam_unix(sshd:session): session closed for user username Mar 5 19:45:29 localhost sshd[20011]: error: connect_to localhost port 49454: failed. Mar 5 19:45:29 localhost sshd[20011]: channel_by_id: 0: bad id: channel free Mar 5 19:45:29 localhost sshd[20011]: Disconnecting: Received ieof for nonexistent channel 0. Mar 5 19:45:29 localhost sshd[19999]: pam_unix(sshd:session): session closed for user username Mar 5 19:45:29 localhost systemd-logind[787]: Removed session 9.
The x2go server log from the syslog: Here is the session opened first time, successfully, you can see the agent port (49454): Mar 5 18:31:11 localhost /usr/bin/x2gostartagent: creating new session: username-50-1520271069_stDMATE_dp24 2a3a4f78ebac6c1318558ebfebbffff1 3799 YYYY.98 49454 49455 49456 -1 -1
In the syslog I did not find any related information about nxagent closing, but only the unsuccessful reconnect after 1 hour and 14 minutes. First reconnect, I was able to see the session selector window and I saw the session as running state, but I had only Suspend and Terminate buttons active. I pushed the suspend and resume, problem occurred.
Here are the packages on the server: ii cups-x2go 3.0.1.3- 1 all Virtual X2Go printer for CUPS ii libx2go-log-perl 4.1.0.0- 0~1517~ubuntu16.04.1 all Perl X2Go::Log package ii libx2go-server-db-perl 4.1.0.0- 0~1517~ubuntu16.04.1 i386 Perl X2Go::Server:DB package ii libx2go-server-perl 4.1.0.0- 0~1517~ubuntu16.04.1 all Perl X2Go::Server package rc x2goagent 2:3.5.0.33- 0~710~ubuntu16.04.1 all X2Go agent rc x2godesktopsharing 3.1.1.4- 0~186~ubuntu16.04.1 i386 Share X11 desktops with other users via X2Go ii x2gomatebindings 0.0.1.5- 0~203~ubuntu16.04.1 i386 X2Go MATE bindings and MIME types ii x2goserver 4.1.0.0- 0~1517~ubuntu16.04.1 i386 X2Go server daemon scripts ii x2goserver-common 4.1.0.0- 0~1517~ubuntu16.04.1 i386 X2Go Server (common files) ii x2goserver-extensions 4.1.0.0- 0~1517~ubuntu16.04.1 all X2Go Server (extension support) ii x2goserver-printing 4.1.0.0- 0~1517~ubuntu16.04.1 all X2Go server (printing support) ii x2goserver-x2goagent 4.1.0.0- 0~1517~ubuntu16.04.1 all X2Go Server's X2Go Agent rc x2goserver-xsession 4.1.0.0- 0~1517~ubuntu16.04.1 all X2Go Server (Xsession runner)
Here are the packages on the client: ii cups- x2go 3.0.1.3- 1 all Virtual X2Go printer for CUPS rc x2goagent 2:3.5.0 .33-0~710~ubuntu16.04.1 all X2Go agent ii x2goclient 4.1.1.1 -0~1719~ubuntu16.04.1 amd64 X2Go Client application (Qt4) rc x2gomatebindings 0.0.1.5 -0~203~ubuntu16.04.1 amd64 X2Go MATE bindings and MIME types rc x2goserver 4.0.1.2 2-0~1197~ubuntu16.04.1 amd64 X2Go server daemon scripts rc x2goserver- printing 4.0.1.22- 0~1197~ubuntu16.04.1 all X2Go server daemon scripts (printing) rc x2goserver- xsession 4.0.1.22- 0~1197~ubuntu16.04.1 all X2Go server daemon scripts (Xsession runner) ii x2gousbmount 1.1.0.2 -0~469~ubuntu16.04.1 all clientside usb mass-storage device mounting