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https://issues.apache.org/jira/browse/GUACAMOLE-414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16484462#comment-16484462
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Michael Jumper commented on GUACAMOLE-414:
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Perhaps libvncclient doesn't like receiving data and sending input events in
separate threads when TLS is in use?
> Certain VNC servers result in disconnection due to TLS errors
> -------------------------------------------------------------
>
> Key: GUACAMOLE-414
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-414
> Project: Guacamole
> Issue Type: Bug
> Components: guacamole-server, guacd
> Affects Versions: 0.9.13-incubating, 0.9.14
> Environment: unRAID 6.4rc9 Docker container
> Reporter: Jason Bean
> Priority: Minor
>
> Connecting to certain VNC servers such as Ubuntu Desktop (all versions I have
> ever run) and a CentOS based Browser Docker
> ([https://hub.docker.com/r/consol/centos-xfce-vnc/]) cause frequent TLS
> errors and consequently disconnections. The errors in the log are as follows:
> {noformat}
> Oct 12 14:54:59 2004ff6050af guacd[8440]: Error reading from TLS: The TLS
> connection was non-properly terminated..
> Oct 12 14:54:59 2004ff6050af guacd[8440]: read (4: Interrupted system call)
> Oct 12 14:54:59 2004ff6050af guacd[8440]: Error handling message from VNC
> server.
> Oct 12 14:54:59 2004ff6050af guacd[8440]: Internal VNC client disconnected
> {noformat}
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