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https://issues.apache.org/jira/browse/GUACAMOLE-620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16608555#comment-16608555
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Michael Jumper commented on GUACAMOLE-620:
------------------------------------------
{quote}
It's a self written servlet, as far as I know it is almost as same as official
one except authentication part.
{quote}
Regardless of how confidently you feel that it couldn't possibly be your
changes, available evidence does not support that conclusion. Those changes are
so far the only difference between a deployment that works and a deployment
that doesn't.
If you do not see this behavior with the mainline Guacamole webapp, but you do
see this with your custom webapp, that strongly suggests the issue is in the
custom component, particularly since the general Guacamole user base is not
encountering this issue.
Please see:
* http://guacamole.apache.org/faq/#probably-not-a-bug
* http://guacamole.apache.org/faq/#test-against-latest-version
Specifically:
{quote}
Please remember that Guacamole is used by many others without issue, and the
_more fundamental a problem is, the less likely it’s a bug_. Before assuming
that you have found a bug, perform basic troubleshooting steps to confirm that
Guacamole itself is the only factor affecting whether things work correctly:
...
We cannot look into issues which have not actually been reproduced in the
latest version of our code. If the problem you’re experiencing has only been
reproduced in an older or modified version of Guacamole, the chance is high
that the problem has either already been addressed (even if you cannot find a
bug report which specifically covers the issue) or that the problem is due to
the difference between your code and upstream (even if you are absolutely
positive this is impossible).
Before reporting an issue upstream, please confirm that the issue exists within
the latest version of the upstream code.
{quote}
I'm still interested in seeing the .pcap, but I expect it will show that
instructions are being mangled before being sent to guacd by the servlet in
question, with guacd aborting the connection because of the protocol violation.
If that's the case, then the issue is absolutely truly within your servlet.
> User input thread automatically exit with an instruction parse error
> --------------------------------------------------------------------
>
> Key: GUACAMOLE-620
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-620
> Project: Guacamole
> Issue Type: Bug
> Components: libguac
> Affects Versions: 0.9.14
> Reporter: Changkun Ou
> Priority: Minor
>
> Remote desktop protocol: RDP
> User experience:
> A user operates a few minutes, then the desktop display froze. A browser
> refresh can connect to the server desktop again.
> Under the hood:
> Observed `guacd` log shows the user is disconnected.
> A warning level log shows that {{guac_user_input_thread}} automatically exit
> with an instruction parser error:
> {code}
> Guacamole connection failure: Instruction parse error
> {code}
> Here is a happening context captured in a browser, where the server sends
> {{10.disconnect}} since last {{sync}} instruction:
>
> {code}
> server: 4.sync,8.24744179;
> client: 4.sync,8.24744179;
> client: 5.mouse,3.667,3.459,1.1;
> client: 5.mouse,3.627,3.470,1.1;
> client: 5.mouse,3.597,3.470,1.1;
> client: 5.mouse,3.493,3.442,1.1;
> server: 4.copy,1.0,3.241,3.368,3.617,3.355,2.14,1.0,1.0,3.377;
> server: 4.copy,1.0,3.241,3.366,3.616,1.2,2.14,1.0,1.0,3.375;
> server: 4.copy,1.0,3.241,3.365,3.615,1.1,2.14,1.0,1.0,3.374;
> server: 4.copy,1.0,3.241,3.364,3.613,1.1,2.14,1.0,1.0,3.373;
> server: 4.copy,3.-25,1.0,1.0,2.64,1.1,2.14,1.0,3.220,3.364;
> server: 4.copy,3.-25,1.0,1.0,2.64,1.1,2.14,1.0,3.284,3.364;
> server: 4.copy,3.-25,1.0,1.0,2.64,1.1,2.14,1.0,3.348,3.364;
> server: 4.copy,3.-25,1.0,1.0,2.64,1.1,2.14,1.0,3.412,3.364;
> server: 4.copy,3.-25,1.0,1.0,2.64,1.1,2.14,1.0,3.476,3.364;
> server: 4.copy,3.-25,1.0,1.0,2.64,1.1,2.14,1.0,3.540,3.364;
> server: 4.copy,3.-25,1.0,1.0,2.64,1.1,2.14,1.0,3.604,3.364;
> server: 4.copy,3.-25,1.0,1.0,2.64,1.1,2.14,1.0,3.668,3.364;
> server: 4.copy,3.-25,1.0,1.0,2.64,1.1,2.14,1.0,3.732,3.364;
> server: 4.copy,4.-113,1.0,1.0,2.58,1.1,2.14,1.0,3.796,3.364;
> server: 4.copy,3.-25,1.0,1.0,2.64,1.1,2.14,1.0,3.218,3.365;
> server: 4.copy,3.-25,1.0,1.0,2.64,1.1,2.14,1.0,3.282,3.365;
> server: 4.copy,3.-25,1.0,1.0,2.64,1.1,2.14,1.0,3.346,3.365;
> server: 4.copy,3.-25,1.0,1.0,2.64,1.1,2.14,1.0,3.410,3.365;
> server: 4.copy,3.-25,1.0,1.0,2.64,1.1,2.14,1.0,3.474,3.365;
> server: 4.copy,3.-25,1.0,1.0,2.64,1.1,2.14,1.0,3.538,3.365;
> server: 4.copy,3.-25,1.0,1.0,2.64,1.1,2.14,1.0,3.602,3.365;
> server: 4.copy,3.-25,1.0,1.0,2.64,1.1,2.14,1.0,3.666,3.365;
> server: 4.copy,3.-25,1.0,1.0,2.64,1.1,2.14,1.0,3.730,3.365;
> server: 4.copy,4.-114,1.0,1.0,2.62,1.1,2.14,1.0,3.794,3.365;
> server: 4.copy,3.-26,1.0,1.0,2.64,1.2,2.14,1.0,3.217,3.366;
> server: 4.copy,3.-26,1.0,1.0,2.64,1.2,2.14,1.0,3.281,3.366;
> server: 4.copy,3.-26,1.0,1.0,2.64,1.2,2.14,1.0,3.345,3.366;
> server: 4.copy,3.-26,1.0,1.0,2.64,1.2,2.14,1.0,3.409,3.366;
> server: 4.copy,3.-26,1.0,1.0,2.64,1.2,2.14,1.0,3.473,3.366;
> server: 4.copy,3.-26,1.0,1.0,2.64,1.2,2.14,1.0,3.537,3.366;
> server: 4.copy,3.-26,1.0,1.0,2.64,1.2,2.14,1.0,3.601,3.366;
> server: 4.copy,3.-26,1.0,1.0,2.64,1.2,2.14,1.0,3.665,3.366;
> server: 4.copy,3.-26,1.0,1.0,2.64,1.2,2.14,1.0,3.729,3.366;
> server: 4.copy,3.-26,1.0,1.0,2.64,1.2,2.14,1.0,3.793,3.366;
> server: 4.copy,4.-594,1.0,1.0,2.64,1.5,2.14,1.0,3.216,3.368;
> server: 4.copy,4.-594,1.0,1.0,2.64,1.5,2.14,1.0,3.280,3.368;
> server: 4.copy,4.-594,1.0,1.0,2.64,1.5,2.14,1.0,3.344,3.368;
> server: 4.copy,4.-594,1.0,1.0,2.64,1.5,2.14,1.0,3.408,3.368;
> server: 4.copy,4.-594,1.0,1.0,2.64,1.5,2.14,1.0,3.472,3.368;
> server: 4.copy,4.-594,1.0,1.0,2.64,1.5,2.14,1.0,3.536,3.368;
> server: 4.copy,4.-594,1.0,1.0,2.64,1.5,2.14,1.0,3.600,3.368;
> server: 4.copy,4.-594,1.0,1.0,2.64,1.5,2.14,1.0,3.664,3.368;
> server: 4.copy,4.-594,1.0,1.0,2.64,1.5,2.14,1.0,3.728,3.368;
> server: 4.copy,4.-594,1.0,1.0,2.64,1.5,2.14,1.0,3.792,3.368;
> server: 3.img,1.3,2.14,1.0,9.image/png,3.856,3.368;
> server:
> 4.blob,1.3,112.iVBORw0KGgoAAAANSUhEUgAAAAIAAAAFAQMAAABVfa/fAAAAA1BMVEUQIDF/BroyAAAAC0lEQVQImWNggAEAAAoAAWeL7ekAAAAASUVORK5CYII=;
> server: 3.end,1.3;
> server: 4.copy,3.-25,1.0,1.0,2.64,1.1,2.14,1.0,3.613,3.373;
> server: 4.copy,3.-25,1.0,1.0,2.64,1.1,2.14,1.0,3.677,3.373;
> server: 4.copy,3.-25,1.0,1.0,2.64,1.1,2.14,1.0,3.741,3.373;
> server: 4.copy,4.-634,1.0,1.0,2.53,1.1,2.14,1.0,3.805,3.373;
> server: 4.copy,4.-634,1.0,1.0,2.53,1.1,2.14,1.0,3.805,3.373;
> server: 4.copy,3.-25,1.0,1.0,2.64,1.1,2.14,1.0,3.679,3.374;
> server: 4.copy,3.-25,1.0,1.0,2.64,1.1,2.14,1.0,3.743,3.374;
> server: 4.copy,4.-635,1.0,1.0,2.51,1.1,2.14,1.0,3.807,3.374;
> server: 4.copy,3.-26,1.0,1.0,2.64,1.2,2.14,1.0,3.616,3.375;
> server: 4.copy,3.-26,1.0,1.0,2.64,1.2,2.14,1.0,3.680,3.375;
> server: 4.copy,3.-26,1.0,1.0,2.64,1.2,2.14,1.0,3.744,3.375;
> server: 4.copy,4.-639,1.0,1.0,2.50,1.2,2.14,1.0,3.808,3.375;
> server: 4.copy,2.-4,1.0,1.0,2.64,2.63,2.14,1.0,3.617,3.377;
> server: 4.copy,2.-4,1.0,1.0,2.64,2.63,2.14,1.0,3.681,3.377;
> server: 4.copy,2.-4,1.0,1.0,2.64,2.63,2.14,1.0,3.745,3.377;
> server: 4.copy,4.-636,1.0,1.0,2.49,2.63,2.14,1.0,3.809,3.377;
> server: 4.copy,2.-4,1.0,1.0,2.64,2.63,2.14,1.0,3.617,3.440;
> server: 4.copy,2.-4,1.0,1.0,2.64,2.63,2.14,1.0,3.681,3.440;
> server: 4.copy,2.-4,1.0,1.0,2.64,2.63,2.14,1.0,3.745,3.440;
> server: 4.copy,4.-636,1.0,1.0,2.49,2.63,2.14,1.0,3.809,3.440;
> server: 4.copy,2.-4,1.0,1.0,2.64,2.63,2.14,1.0,3.617,3.503;
> server: 4.copy,2.-4,1.0,1.0,2.64,2.63,2.14,1.0,3.681,3.503;
> server: 4.copy,2.-4,1.0,1.0,2.64,2.63,2.14,1.0,3.745,3.503;
> server: 4.copy,4.-636,1.0,1.0,2.49,2.63,2.14,1.0,3.809,3.503;
> server: 4.copy,2.-4,1.0,1.0,2.64,2.63,2.14,1.0,3.617,3.566;
> server: 4.copy,2.-4,1.0,1.0,2.64,2.63,2.14,1.0,3.681,3.566;
> server: 4.copy,2.-4,1.0,1.0,2.64,2.63,2.14,1.0,3.745,3.566;
> server: 4.copy,4.-636,1.0,1.0,2.49,2.63,2.14,1.0,3.809,3.566;
> server: 4.copy,2.-4,1.0,1.0,2.64,2.63,2.14,1.0,3.617,3.629;
> server: 4.copy,2.-4,1.0,1.0,2.64,2.63,2.14,1.0,3.681,3.629;
> server: 4.copy,2.-4,1.0,1.0,2.64,2.63,2.14,1.0,3.745,3.629;
> server: 4.copy,4.-636,1.0,1.0,2.49,2.63,2.14,1.0,3.809,3.629;
> server: 4.copy,4.-822,1.0,1.0,2.64,2.40,2.14,1.0,3.617,3.692;
> server: 4.copy,4.-822,1.0,1.0,2.64,2.40,2.14,1.0,3.681,3.692;
> server: 4.copy,4.-822,1.0,1.0,2.64,2.40,2.14,1.0,3.745,3.692;
> server: 3.img,1.3,2.14,1.0,9.image/png,3.809,3.692;
> server:
> 4.blob,1.3,116.iVBORw0KGgoAAAANSUhEUgAAADEAAAAoAQMAAABti4AMAAAAA1BMVEUQIDF/BroyAAAADUlEQVQYlWNgGAWUAAABQAABuwBcGQAAAABJRU5ErkJggg==;
> server: 3.end,1.3;
> server: 4.sync,8.24744258;
> server: 7.dispose,5.-1017;
> server: 10.disconnect;
> client: 10.disconnect;
> {code}
>
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