"invalid display size" when connecting vncviewer (RHEL7) to UltraVNC server (Windows10)

Rich Crompton

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Jun 16, 2021, 4:11:30 PM6/16/21

to TigerVNC User Discussion/Support

I have a VNC server running on a Windows10 server and I'm able to connect with several VNC clients except for TigerVNC (vncviewer) from a RHEL7 system. It seems no matter what options I specify for vncviewer that I receive this message:

"invalid display size"

Connecting with other clients from the same RHEL7 system works okay. Thoughts?

DRC

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Jun 16, 2021, 4:19:39 PM6/16/21

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Is the VNC server UltraVNC, by chance? If so, then it's a known issue:

https://github.com/TurboVNC/turbovnc/issues/292#issuecomment-846297031

They unfortunately chose to invent their own server-to-client extended
desktop size message rather than following the documented specification
of the existing extended desktop size message. In other words, they are
violating the RFB protocol.

Rich Crompton

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Jun 16, 2021, 5:13:58 PM6/16/21

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It is UltraVNC, indeed. Good to know; I'll look at alternatives on the server. Thanks!

Pierre Ossman

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Jun 17, 2021, 3:30:51 AM6/17/21

to Rich Crompton, TigerVNC User Discussion/Support

On 16/06/2021 23:13, Rich Crompton wrote:
> It is UltraVNC, indeed. Good to know; I'll look at alternatives on the
> server. Thanks!
>

This should be fixed in the development version of UltraVNC, so see if
you can try that.

Regards
--
Pierre Ossman Software Development
Cendio AB https://cendio.com
Teknikringen 8 https://twitter.com/ThinLinc
583 30 Linköping https://facebook.com/ThinLinc
Phone: +46-13-214600

A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

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