On Nov 2, 2017, at 1:13 AM, Mihai Moldovan <ionic@ionic.de> wrote:

On 11/01/2017 02:31 PM, Robert Kudyba wrote:
ls -a /tmp/.X11-unix
ps axu | grep -iE '(nx|x2goagent)'

Naturally on the server side.

ls -a /tmp/.X11-unix
.  ..  X0

Hum... if there are no stale X sockets, why is x2gostartagent counting up?

What do ps axu | grep -iE '(nx|x2go)agent' and x2golistsessions_root say?

Both commands come back with nothing.

[...]
[myuser@myworkstation ~]$ xauth list
erdos.sub.ourshool.edu/unix:0 <http://erdos.sub.ourshool.edu/unix:0> 
MIT-MAGIC-COOKIE-1  dfae2f651992831ac371ed79e246969d
myworkstation/unix:135  MIT-MAGIC-COOKIE-1  a07673b2f4a6762816b74954bb7c4d08
myworkstation.dsm.ourshool.edu:135 <http://myworkstation.dsm.ourshool.edu:135> 
MIT-MAGIC-COOKIE-1  a07673b2f4a6762816b74954bb7c4d08
erdos/unix:222  MIT-MAGIC-COOKIE-1  c2e600da0e177cd41f5ac4325267fc02
erdos.sub.ourshool.edu/unix:222 <http://erdos.sub.ourshool.edu/unix:222> 
MIT-MAGIC-COOKIE-1  c2e600da0e177cd41f5ac4325267fc02
myworkstation/unix:141  MIT-MAGIC-COOKIE-1  6491ffce94620e7009a1e89858326a9c
myworkstation.sub.ourshool.edu:141 <http://myworkstation.sub.ourshool.edu:141> 
MIT-MAGIC-COOKIE-1  6491ffce94620e7009a1e89858326a9c
myworkstation/unix:143  MIT-MAGIC-COOKIE-1  0e851008661538233db64a10868ce953
myworkstation.sub.ourshool.edu:143 <http://myworkstation.sub.ourshool.edu:143> 
MIT-MAGIC-COOKIE-1  0e851008661538233db64a10868ce953
myworkstation/unix:144  MIT-MAGIC-COOKIE-1  e9221e75a72dde8abb668e08396b043a
myworkstation.sub.ourshool.edu:144 <http://myworkstation.sub.ourshool.edu:144> 
MIT-MAGIC-COOKIE-1  e9221e75a72dde8abb668e08396b043a
dsm.sub.ourshool.edu/unix:10 <http://dsm.sub.ourshool.edu/unix:10> 
MIT-MAGIC-COOKIE-1  1862bc203e0f1f39d6f06dca384dc134
kopernik.sub.ourshool.edu/unix:10 <http://kopernik.sub.ourshool.edu/unix:10> 
MIT-MAGIC-COOKIE-1  4cb123498718884f4e5b2f3dc91e2c97
dsm.sub.ourshool.edu/unix:11 <http://dsm.sub.ourshool.edu/unix:11> 
MIT-MAGIC-COOKIE-1  e66b6650e7a0f315f9b58f1649de332c
myworkstation.sub.ourshool.edu/unix:10
<http://myworkstation.sub.ourshool.edu/unix:10>  MIT-MAGIC-COOKIE-1 
78040df9ea9c3825e6bfa886c9bf27e1
myworkstation.sub.ourshool.edu/unix:23
<http://myworkstation.sub.ourshool.edu/unix:23>  MIT-MAGIC-COOKIE-1 
aa0dd8187b5ed170fc8b10c5f6953c96
[myuser@myworkstation ~]$ xauth remove :23
[myuser@myworkstation ~]$ kill $!
Session: Terminating session at 'Wed Nov  1 09:28:08 2017'.
Session: Session terminated at 'Wed Nov  1 09:28:08 2017'.
[myuser@myworkstation ~]$ FreeFontPath: FPE "/usr/share/nx/fonts/misc/" refcount
is 2, should be 1; fixing.

[1]+  Done                    nxagent :23

Okay, that's interesting and maybe explains why authentication is not working
properly. You seem to be affected by the same issue that the tcsh user saw
earlier - HOSTNAME is set to a FQDN name, while the authentication requires a
short name only. Something seems to be setting and exporting HOSTNAME to a value
other than the autogenerated value that bash employs.

Can you please upgrade your system? You're already using nightly x2goserver
builds, so just updating should pull in a fix for this issue. Your version is
just one day shy of the date I published a fix for it…

OK updated, rpm -q x2goserver
x2goserver-4.1.0.0-0.0x2go1.0.git20171102.1436.heuler.fc26.x86_64

Fails with both XFCE and MATE, local and NIS user:
Connection failed. DBD::SQLite::st execute failed: UNIQUE constraint failed: sessions.display at /usr/share/perl5/vendor_perl/X2Go/Server/DB/SQLite3.pm line 233. : /usr/lib64/x2go/libx2go-server-db-sqlite3-wrapper insertsession 50 sobolev localguy-50-1509631597_stDXFCE_dp32 at /usr/share/perl5/vendor_perl/X2Go/Server/DB.pm line 208. Unable to insert new session into database; parameters: port (50), hostname (sobolev) and session name (localguy-50-1509631597_stDXFCE_dp32). 

Connection failed. DBD::SQLite::st execute failed: UNIQUE constraint failed: sessions.display at /usr/share/perl5/vendor_perl/X2Go/Server/DB/SQLite3.pm line 233. : /usr/lib64/x2go/libx2go-server-db-sqlite3-wrapper insertsession 50 sobolev me-50-1509632000_stDMATE_dp32 at /usr/share/perl5/vendor_perl/X2Go/Server/DB.pm line 208. Unable to insert new session into database; parameters: port (50), hostname (sobolev) and session name (me-50-1509632000_stDMATE_dp32). 

Nov  2 10:13:19 sobolev /usr/bin/x2gostartagent[18228]: x2gostartagent called with options: 800x600 adsl 16m-jpeg-9 unix-kde-depth_32 us query 0 D MATE both
Nov  2 10:13:19 sobolev /usr/bin/x2gosessionlimit[18245]: x2gosessionlimit has been called
Nov  2 10:13:19 sobolev x2golistsessions[18249]: x2golistsessions has been called with options: --all-servers
Nov  2 10:13:20 sobolev /usr/bin/x2gostartagent[18289]: Unable to insert new session into database; parameters: port (50), hostname (sobolev) and session name (me-50-1509632000_stDMATE_dp32).