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https://issues.apache.org/jira/browse/GUACAMOLE-2118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18018459#comment-18018459
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Niko edited comment on GUACAMOLE-2118 at 9/5/25 6:28 PM:
---------------------------------------------------------
[~vnick]
we don’t use SFTP or session recording, so we can rule those out.
Right now, we haven’t been able to find a reproducible pattern – it doesn’t
affect every connection, but with the amount of daily RDP/VNC/SSH sessions we
have, we regularly end up with a few stuck processes.
To give you an idea of the scale: over the past few days we’ve seen roughly
this number of connections per day:
{code:java}
+------------+----------+-------------+
| day | protocol | connections |
+------------+----------+-------------+
| 2025-09-05 | rdp | 207 |
| 2025-09-05 | ssh | 8 |
| 2025-09-05 | vnc | 466 |
| 2025-09-04 | rdp | 210 |
| 2025-09-04 | ssh | 6 |
| 2025-09-04 | vnc | 660 |
| 2025-09-03 | rdp | 141 |
| 2025-09-03 | ssh | 13 |
| 2025-09-03 | vnc | 559 |
| 2025-09-02 | rdp | 184 |
| 2025-09-02 | ssh | 6 |
| 2025-09-02 | vnc | 550 |
| 2025-09-01 | rdp | 223 | {code}
We’ll continue to monitor the situation and try to identify a reproducible
scenario or at least some commonalities between the failing connections.
was (Author: JIRAUSER284621):
Hi Nick,
we don’t use SFTP or session recording, so we can rule those out.
Right now, we haven’t been able to find a reproducible pattern – it doesn’t
affect every connection, but with the amount of daily RDP/VNC/SSH sessions we
have, we regularly end up with a few stuck processes.
To give you an idea of the scale: over the past few days we’ve seen roughly
this number of connections per day:
{code:java}
+------------+----------+-------------+
| day | protocol | connections |
+------------+----------+-------------+
| 2025-09-05 | rdp | 207 |
| 2025-09-05 | ssh | 8 |
| 2025-09-05 | vnc | 466 |
| 2025-09-04 | rdp | 210 |
| 2025-09-04 | ssh | 6 |
| 2025-09-04 | vnc | 660 |
| 2025-09-03 | rdp | 141 |
| 2025-09-03 | ssh | 13 |
| 2025-09-03 | vnc | 559 |
| 2025-09-02 | rdp | 184 |
| 2025-09-02 | ssh | 6 |
| 2025-09-02 | vnc | 550 |
| 2025-09-01 | rdp | 223 | {code}
We’ll continue to monitor the situation and try to identify a reproducible
scenario or at least some commonalities between the failing connections.
> unable to upgrade 1.5.5 to 1.6.0 due to sporadic hanging issue
> --------------------------------------------------------------
>
> Key: GUACAMOLE-2118
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-2118
> Project: Guacamole
> Issue Type: Bug
> Affects Versions: 1.6.0
> Reporter: Jason Keltz
> Priority: Major
> Attachments: guacamole-logs.txt, guacd-178388-gdb.txt,
> guacd-178388-lsof.txt, guacd-240326-gdb.txt, guacd-240326-lsof.txt
>
>
> I've been running Guacamole since around 2020, upgrading reasonably quickly
> each and every time there's been an update. I update my Tomcat to the latest
> 9.X release from time to time (currently 9.0.102) , and my JDK to the latest
> 8.X release from time to time (currently jdk8u452-b09).
> Recently, after attempting an upgrade from Guacamole 1.5.5 to 1.6.0, I ran
> into a problem. Initially, everything seemed to work just fine. I can
> connect to any of the systems I have available. However, at some point
> later, I notice in the tomcat logs a lot of "connects" and "disconnects" to
> hosts. Users start complaining that "Guacamole isn't working". What I
> noticed at this point was that when they would try to return to a connection,
> it would connect, and their existing connecting would start to redraw, but
> it would hang in the middle. If I restart guacd at this point, it starts to
> work again, but the problem comes back. Some users would see it. Other users
> were fine.
> I feel like there's a bug hiding, and it may require a lot of user activity
> to get to it. I ended up creating a devel system for testing, and I'm
> running guac 1.6.0 there, and I've enabled full debugging, but I can't seem
> to make it happen here yet. Is there any easy way I can force a bunch of
> connections? The devel system is running labtest Rocky 8.10 (RHEL8.10) with
> latest kernel and patches and this matches the production system. They are
> both installed with the same kickstart configuration.
> I'm opening this "bug" even though I don't have concrete information yet. If
> I really have to do it, I may have to re-install on the production system to
> get the debugging information that I need, but I'd rather not do it if not
> necessary since it causes user inconvenience, and Guacamole is an important
> part of our educational environment.
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