Indirect connection works better

James Weatherall jnw at
Thu May 14 16:20:35 BST 2009

Hi Philip,

Some Wi-Fi routers have trouble handling large numbers of small network packets, such as are produced when moving the mouse around in the VNC session, and that in turn can upset the Windows TCP stack and lead to the sort of behaviour you're seeing.

You can enable the "Pointer event rate-limiting" feature in the VNC Viewer to work around this problem.


Wez @ RealVNC Ltd

> -----Original Message-----
> Sent: 14 May 2009 15:34
> Subject: Indirect connection works better
> Recent came across a situation again which has puzzled me in the past.
> I'm
> trying to connect to a machine running VNC Free edition in an office.
> I can
> make the connection (having set up port forwarding on the router) but
> it
> hangs, with only the top third of the screen visible after several
> minutes.
> Further attempts produced the same result.
> That office has a workstation used as a simple workstation.  Unlike the
> "target" machine, which is wirelessly connected, this one is connected
> to
> the router by cable.  I can connect reliably to the fileserver PC.  I
> found
> that within my remote session I could start a new session from the
> fileserver PC to the target PC, and this worked well.
> Now that's using the same links, but in two jumps instead of one.
> What's
> going on?
> Phil, London
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