[X2Go-Dev] x2go client session kicks user back to the session login screen

Tue Sep 29 01:34:12 CEST 2015

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Hey Liz,

first, your two server logfiles were anonymized in different locations.
One showed the IP, but not the node name, the other the node name, but
not the IP.

So now I'm confused - are you trying to connect to the same server,
from both clients?  Or are these two different servers, not only two
different clients?

Second, the screenshots in your original message showed a firewall
popup.  It doesn't look like you allowed incoming connections for
x2goclient.app yet?  Judging from what Mihai (one of our resident Mac
experts here on the list) told me, you have to, or X2GoClient won't work
.

Third, could you run the following four tests on the terminal of both
the affected and the unaffected machine and compare the output for
each test between affected and unaffected?

ssh non-root-user at x2goserver

See if the connection works and if you see a banner message.  Make a
copy of the banner message if there is one, so you can compare it.

ssh root at x2goserver

See if the connection works and if you see a banner message. Make a
copy of the banner message if there is one, so you can compare it.

ssh -X non-root-user at x2goserver

type "xterm" after you see the shell prompt, see if XTerm comes up and
there are no error messages on the console

ssh -X root at x2goserver

type "xterm" after you see the shell prompt, see if XTerm comes up and
there are no error messages on the console

Fourth, another hint from Mihai, in the xquartz settings, there's a
"Security" tab.  Could you take a screenshot of the current settings
there, please, and post the screenshots for both machines?

Last, it would be interesting to know if the affected machine is in
the same IP network as the unaffected one, or not.  To find out, run

ifconfig -a

in each Mac's terminal and compare the results.

Kind Regards,
Stefan

Am 29.09.2015 um 00:26 schrieb Real, Elizabeth (392K):
> Stephan,
> 
> I reinstalled xquartz 2.7.7 and x2goclient 4.0.5 and verified the 
> settings are set to those recommended.
> 
> The behavior is happening when regular users attempt to connect to
> an x2go server. This leads me to believe it could be a permissions
> issue?
> 
> When I attempt to connect as a regular linux user, I get kicked
> back to the login scree. However when I connect as ‘root’ there are
> no problems.
> 
> CLIENT LOGIN AS REGULAR USER: I noticed that if I attempt to login
> as a regular linux user (real), that user gets kicked back to the
> login screen, here’s the session output: "Protocol mismatch or no X
> authentication data”
> 
> SERVER: The /var/log/secure reports: Sep 28 15:11:34 ****
> sshd[27639]: Accepted keyboard-interactive/pam for real from
> 137.79.38.166 port 52380 ssh2 Sep 28 15:11:34 **** sshd[27639]:
> pam_unix(sshd:session): session opened for user real by (uid=0) Sep
> 28 15:11:38 **** su: pam_unix(su:session): session opened for user 
> real by (uid=0) Sep 28 15:11:38 **** su: pam_unix(su:session):
> session closed for user real
> 
> When I check the status of x2gocleansessions.service: Sep 28
> 15:11:36 ******* /usr/sbin/x2gocleansessions[769]: 
> real-50-1443478272_stDKDE_dp32: state file for this session does
> not exist: /tmp/.x2go-real/C-real-50-1443478272_stDKDE_dp32/state
> (this can be ignored during session startups)
> 
> CLIENT LOGIN AS ROOT: As root there are no issues.
> 
> SERVER: /var/log/secure shows: Sep 28 15:21:04 node4 sshd[6137]:
> Accepted password for root from ********* port 52504 ssh2 Sep 28
> 15:21:04 node4 sshd[6137]: pam_unix(sshd:session): session opened 
> for user root by (uid=0) Sep 28 15:21:15 node4 polkitd[1516]:
> Registered Authentication Agent for unix-session:46638 (system bus
> name :1.102126 
> [/usr/libexec/kde4/polkit-kde-authentication-agent-1], object path 
> /org/kde/PolicyKit1/AuthenticationAgent, locale C) Sep 28 15:21:17
> node4 sshd[7291]: Accepted publickey for rmdc from ********** port
> 50161 ssh2: RSA 81:72:dd:4f:3d:a2:18:ba:ed:77:2a:1d:2e:72:f6:4b Sep
> 28 15:21:17 node4 sshd[7291]: pam_unix(sshd:session): session
> opened for user rmdc by (uid=0) Sep 28 15:21:17 node4 sshd[7291]:
> pam_unix(sshd:session): session closed for user rmdc Sep 28
> 15:21:23 node4 sshd[7347]: Accepted publickey for root from 
> ********** port 49422 ssh2: RSA 
> 23:2c:8c:a6:fd:aa:80:ae:7e:fa:60:57:5f:e4:c2:98 Sep 28 15:21:23
> node4 sshd[7347]: pam_unix(sshd:session): session opened for user
> root by (uid=0)
> 
> Thank you, Liz
> 
> 
> From: Elizabeth Real Chavez <Elizabeth.Real at jpl.nasa.gov 
> <mailto:Elizabeth.Real at jpl.nasa.gov>> Date: Thursday, September 24,
> 2015 at 9:12 AM To: "x2go-dev at lists.x2go.org
> <mailto:x2go-dev at lists.x2go.org>" <x2go-dev at lists.x2go.org
> <mailto:x2go-dev at lists.x2go.org>> Subject: x2go client session
> kicks user back to the session login screen
> 
> Hello,
> 
> I have a user who is not able to connect to an x2go server using
> x2go client for Mac. When I connect to the x2go server in question
> I am able to successfully connect and login. I’ve compared settings
> between the user’s and my Mac x2go client and they are identical.
> 
> I’ve attached screen shots of the client session details. The last 
> messages in the session are:
> 
> * Info: Your session was closed before reaching a usable state. *
> Info: This can be due to the local X server refusing access to the 
> client. * Info: Please check authorization provided by the remote X
> application. * Session: Session terminated at
> 
> x2go client: v4.0.4.0 xquarts: v2.7.7
> 
> Tried uninstalling the x2go client and installing it again but that
> did not help. Same errors while attempt is made to connect to x2go
> server.
> 
> Please advise.
> 
> Thank you, Liz
> 
> 
> 
> _______________________________________________ x2go-dev mailing
> list x2go-dev at lists.x2go.org 
> http://lists.x2go.org/listinfo/x2go-dev
> 

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