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https://issues.apache.org/jira/browse/GUACAMOLE-1196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17906152#comment-17906152
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Nick Couchman commented on GUACAMOLE-1196:
------------------------------------------
I ran a packet capture with resize both enabled and disabled, and here are the
results...
==Resize Disabled==
* Connection
* Authentication
* Share desktop flag sent to VNC server
* Server framebuffer parameters returned to client (guacd)
* Client set pixel format to VNC server
* Client set encoding to VNC server
* Client framebuffer update request to VNC server
* TCP ACK to client (guacd)
* TCP PUSH+ACK to client (guacd)
* Server framebuffer update to client (guacd)
* Client framebuffer update request to VNC server
* etc.
==Resize Enabled==
* Connection
* Authentication
* Share desktop flag to VNC server
* Server framebuffer parameters return to client (guacd)
* Client set pixel format to VNC server
* Client set encodings to VNC server
* Client framebuffer update request to VNC server
* TCP ACK to client (guacd)
* TCP PUSH+ACK to client (guacd)
* Unknown client message type (251) to VNC server
* Unknown client message type (1) to VNC server
* Client framebuffer update request to VNC server
* Server framebuffer update to client (guacd)
* RST+ACK to client (guacd) -> Connection dead.
It looks like maybe we're sending the initial resize message at the "wrong"
time - either when the VNC server isn't expecting it, or we're disrupting
something initially happening in the client <-> server handshake, where the
client has already sent an update message and is expecting to process a
response, but then we're telling the client to send something else and it's
getting confused on the replies?
> Add auto resize to VNC sessions
> -------------------------------
>
> Key: GUACAMOLE-1196
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-1196
> Project: Guacamole
> Issue Type: Improvement
> Components: Documentation, VNC
> Reporter: Markus Bonet
> Assignee: Nick Couchman
> Priority: Minor
> Fix For: 1.6.0
>
>
> As discussed on the mailing list:
> {quote}
> I'm running a TigerVNC session on the server where Guacamole is installed. If
> I connect with the TigerVNC viewer there is this nice feature that the remote
> desktop is automatically resized if the viewer window is resized, like this
> if offered with RDP already.
> Is there a configuration how to achieve this with a Guacamole session as well
> for my VNC connection?
> {quote}
> Historically, this could not be done without corresponding support within
> libvncclient. This should now be possible through handling the required
> message type ({{SetDesktopSize}}):
> {quote}
> Unfortunately my team had to come up with a home baked solution for this
> about 2 years ago. But it involved hacking up libvnc.
> BUT, I think it is feasible to submit a feature request for it because now
> libvnc recently tagged a new version that includes the message type that
> guacamole needs to do this:
> Tag: https://github.com/LibVNC/libvncserver/releases/tag/LibVNCServer-0.9.13
> New message:
> https://github.com/rfbproto/rfbproto/blob/master/rfbproto.rst#setdesktopsize
> {quote}
> See:
> [http://apache-guacamole-general-user-mailing-list.2363388.n4.nabble.com/Auto-resize-of-VNC-sessions-td9511.html]
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