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<p>I changed the title of this thread. I believe this error message is the cause
of the problem, but I don't know how to fix.
</p>
<p>Right now, among the dozen Ubuntu 14.04 servers I run,
half of them x2go works, and other half do not work.</p>
<p>all machines have applied the latest updates (x2go 4.1.0-1517 for
the server components, 4.1.1.1-1719 for the client, and libnx-x11-6: 2:3.5.99.16-0)</p>
<p>I compared the package versions, I can't see any difference between
the servers that x2go works vs those failed - all x2go/nx components have
identical versions.
</p>
<p>when connecting to the machine have problems, the server side log
gives "<code>Unable to open display 'nx/nx</code>", full log see below.</p>
<p>this issue only happens in March after some x2go package updates.</p>
<p>please help!
</p>
<p>Qianqian
</p>
<br>
<div class="moz-cite-prefix">On 04/10/2018 01:19 AM, Qianqian Fang
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:c4a7eb77-e5c3-f8cc-6464-1d1de26b6e5a@gmail.com">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<p>hi Mihai and other x2go users,
</p>
<p>I am wondering if you have any further comments or suggestions, I am still unable to connect to more than half of my servers. All failed in the same messages:
</p>
<p><b>On the client side:</b>
</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><code><span style=" font-weight:600;">Connection failed.</span></code><code> Failed to start X2Go Agent session with ID fangq-...._stDXFCE_dp24. X2Go Agent terminated unexpectedly. Aborting session startup. </code>
</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">
</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><b>on the server side:</b></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">
</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><code>Info: Agent running with pid '4112'.</code><code>
</code><code>Session: Starting session at 'Tue Apr 10 01:15:16 2018'.</code><code>
</code><code>Error: Aborting session with 'Unable to open display 'nx/nx,options=/tmp/.x2go-fangq/C-fangq-...._stDXFCE_dp24/options:51''.</code><code>
</code><code>Session: Aborting session at 'Tue Apr 10 01:15:16 2018'.</code><code>
</code><code>Session: Session aborted at 'Tue Apr 10 01:15:16 2018'.</code>
</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">all updated with the latest version of Ubuntu 14.04</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">
</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">Qianqian</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">
</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">
</p>
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</p>
<div class="moz-cite-prefix">On 03/26/2018 10:46 PM, Qianqian Fang
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:f785dd8d-bf79-e729-e8dd-60b4408479cc@gmail.com">
<meta http-equiv="Content-Type" content="text/html;
charset=utf-8">
<div class="moz-cite-prefix">On 03/26/2018 10:44 PM, Mihai
Moldovan wrote:<br>
</div>
<blockquote type="cite"
cite="mid:7649f8fa-e6d7-d490-28bf-9ed3309b5097@ionic.de">
<pre wrap="">Looks good, all old packages are in rc state (i.e., uninstalled, but not purged).
</pre>
<pre wrap="">Sorry, that should have been ls -ldh /usr/lib/*86*/nx/X11/*
I'm interested in the files in there.</pre>
</blockquote>
<br>
here you go<br>
<code><br>
</code><code><b>fangq@zodiac:~$ ls -ldh /usr/lib/*86*/nx/X11/*</b></code><code><br>
</code><code>lrwxrwxrwx 1 root root 20 Mar 17 08:41
/usr/lib/x86_64-linux-gnu/nx/X11/libX11.so.6 ->
../../libNX_X11.so.6</code><code><br>
</code><code>lrwxrwxrwx 1 root root 24 Mar 17 08:41
/usr/lib/x86_64-linux-gnu/nx/X11/libX11.so.6.3.0 ->
../../libNX_X11.so.6.3.0</code><br>
<br>
<br>
<blockquote type="cite"
cite="mid:7649f8fa-e6d7-d490-28bf-9ed3309b5097@ionic.de"><br>
<pre wrap="">Like the other user on the mailing list wrote, purging sessions can be done
using rm -vf /var/lib/x2go/x2go_sessions; x2godbadmin --createdb (both as root),
but if there are no sessions currently that won't do anything useful.</pre>
</blockquote>
<br>
I see. are there other logs that I can find/provide to narrow
down the issue?<br>
<br>
thank you again for your help.<br>
<br>
Qianqian<br>
<br>
<blockquote type="cite"
cite="mid:7649f8fa-e6d7-d490-28bf-9ed3309b5097@ionic.de">
<pre wrap="">
Mihai
</pre>
</blockquote>
<p>
</p>
</blockquote>
<br>
</blockquote>
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