RealVNC doesn't work between two Win-XP systems...

[James Weatherall]

Hi David,

It appears to be a problem with single-threaded network I/O on Windows
systems.  VNC 3.3 series servers (on which TightVNC is based) have separate
send & receive threads, which appears not to trigger the problem.  There
appears to be a bug in Windows' TCP stack which causes it to stop responding
to incoming data if a TCP connection has a full outgoing data buffer and is
continuing to receive data.

Current VNC Enterprise & Personal Edition servers include a MaxOutBufferSize
parameter, which can be used to increase in-server per-connection buffering
of outgoing data, which should fix the problem for you.

Finally, you should find that things are improved if you switch VNC Viewer
to "Rate-limit pointer events".

Regards,

Wez @ RealVNC Ltd.


> -----Original Message-----
> From: David Cook [mailto:David.Hubert.Cook "at" verizon.net] 
> Sent: 20 April 2006 02:06
> To: 'James Weatherall'; vnc-list "at" realvnc.com
> Subject: RE: RealVNC doesn't work between two Win-XP systems...
> 
> Wez -
> 
> 	Hey, very good guess...exactly right!
> 
> So, why is it that RealVNC can't handled that, since
> TightVNC clearly does?  Is there a workaround for
> RealVNC?
> 
> Cheers...
> 
>             Dave
> 
> 
> -----Original Message-----
> From: James Weatherall [mailto:jnw "at" realvnc.com]
> Sent: Wednesday, April 19, 2006 6:42 PM
> To: 'David Cook'; vnc-list "at" realvnc.com
> Subject: RE: RealVNC doesn't work between two Win-XP systems...
> 
> 
> Hi David,
> 
> Are you running connections over a wireless link, by any chance?
> 
> Cheers,
> 
> Wez @ RealVNC Ltd.
>  
> 
> > -----Original Message-----
> > From: vnc-list-admin "at" realvnc.com 
> > [mailto:vnc-list-admin "at" realvnc.com] On Behalf Of David Cook
> > Sent: 19 April 2006 22:54
> > To: vnc-list "at" realvnc.com
> > Subject: RealVNC doesn't work between two Win-XP systems...
> > 
> > Hi -
> > 
> > 	This week, I downloaded the free-edition, V4.1, of
> > Real-VNC.  (I used both VNC and Tight-VNC in the past.)
> > 
> > 	I hate to say it, folks, but I can't make a connection
> > last for longer than about 30 secs and two or three mouse-clicks,
> > before the 'viewer' window on the client just disappears.  I
> > tried one Win-XP machine as 'server' and two other Win-XP
> > machines as clients, all with the same result.
> > 
> > 	[I'd have THOUGHT a v4.1 would be pretty solid.
> > But, rather than fret, or debug, or whatever, I instead loaded
> > the latest 'TightVNC' kit, and that works just fine.]
> > 
> > 	Just thought I'd let you know.  So, can anyone give me
> > a reason why RealVNC might be superior to TightVNC, if I were
> > to invest some cycles in troubleshooting the problem?
> > 
> > 	Anyone have any strong guesses as to what is probably
> > the problem?  (All 3 of the  Win-XPs have SP2 with all the patches.)
> > 
> > 
> > Cheers...
> > 
> > 		Dave
> > 		web-kayak-project:
> > http://mysite.verizon.net/david.hubert.cook/homebuilt-kayak/
> > 		web-GoogleMaps-project:
> > http://mysite.verizon.net/david.hubert.cook/google-maps/
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