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> From: Bo Berglund > I had a possibly related problem a year or so back when I failed to > connect to the remote desktop of a PC on a remote network accessed via > Microsoft PPTP VPN tunnel. > > The remote desktop was drawn up on my PC as a frame and then > everything stopped. After googling and asking on a microsoft NG I got > the advice to change the networking parameter: > HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NdisWan\P arameters\Protocols\0 > value ProtocolMTU > Advice was that the value should be lowered until working. > > I now have it set to 1300 (don't remember what it was before) and then > the remote desktop started to work properly again. > > Is this the same thing, then I would like to know where to change it. > The above fix was connected to the VPN tunnel traffic. > > Any hints? Talk to your network and firewalling team. Modern TCP stacks can be quite aggressive about increasing segment sizes, and I wonder whether there's a combination of increasing segments and a firewall that's blocking incoming ICMP (such as the resulting 'packet size limit exceeded' messages)? Just a guess from general networking background - may be utterly wrong for your environment. - Peter