VNC freezing on Win XP Media Center Edition SP2

[Alex Pelts]

The VPN has MTU larger than MTU of physical network. Lots of packets are 
dropped as somehow VNC sends rather large packets. I had this problem 
myself until I lowered MTU to below of the physical network MTU.

The symptoms were:
1. screen would render half way and then stop.
2. screen updates were extremely slow
3. Connection would go for some short time and then would be dropped.

I am not sure why MTU is causing that effect. I think that VPN packets 
can not be fragmented so they are dropped and there is a large packet 
loss. I am not sure how VNC reacts to large packet loss.

Regards,
Alex


James Weatherall wrote:
> Hi Alex,
> 
> Can you provide any more information on why that causes the effect SB is
> seeing?
> 
> Cheers,
> 
> Wez @ RealVNC Ltd.
> 
> 
>> -----Original Message-----
>> From: vnc-list-admin "at" realvnc.com 
>> [mailto:vnc-list-admin "at" realvnc.com] On Behalf Of Alex Pelts
>> Sent: 25 April 2006 07:07
>> To: S B
>> Cc: vnc-list "at" realvnc.com
>> Subject: Re: VNC freezing on Win XP Media Center Edition SP2
>>
>> MTU is too large on your vpn connection.
>>
>> Regards,
>> Alex
>>
>>
>> S B wrote:
>>> Hi,
>>>
>>> I just bought a new computer from Dell (Intel dual core 
>> 2.8GHz, 1GB RAM
>>> running Win XP Media Center w/ SP2), and downloaded VNC 4.4 
>> viewer on it.
>>> When I VNC to my work machine, VNC viewer freezes 
>> intermittently. Some times
>>> immediately after logging in and some times after 10-15 
>> minutes of work. Did
>>> anyone here faced a similar problem? How do I fix this problem.
>>>
>>> Thanks,
>>> - SB
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