RAS VPN locks up every 4 to 6 minutes

We've recently upgraded our server from a dinky machine running Windows 2000
Terminal Server to Windows 2003 R3.

I've configured the RAS VPN with 1 LAN card (not ideal, I know). The server
sits behind a NetGear firewall/router box which is passing PPTP VPN packets
through to the server.

This is the exact same setup that I configured on the old Windows 2000
Terminal Server, but now the VPN connection is extremely unreliable. I've
configured network connections on both Mac OS X and Windows XP clients. I
connect to the VPN, and I can connect remotely for between 4.5 to 6.5 minutes
(sometimes more, sometimes less), and then the connection hangs. On the
Windows client it appears to disconnect, but the Mac OS X client still
"appears connected", but the connection is effectively dead. If I disconnect
and reconnect, I can get another 4.5 - 6.5 minutes of connectivity.

Any ideas? How can troubleshoot this? This used to work fine on the old
hardware.

It could be MTU issue. This search result may help. Please post back with
the result.

VPN connection is disconnected after several minutesVPN connection is
disconnected after several minutes. We have been seeing more and more cases
like this one. We don’t really know the causes, ...
www.chicagotech.net/VPN/vpn3minutes.htm


--
Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on
http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on
http://www.HowToNetworking.com


"ic notso clearly" <ic notso (E-Mail Removed)> wrote in
message news:B8C6CB36-B67C-4905-A5FD-(E-Mail Removed)...
> We've recently upgraded our server from a dinky machine running Windows
> 2000
> Terminal Server to Windows 2003 R3.
>
> I've configured the RAS VPN with 1 LAN card (not ideal, I know). The
> server
> sits behind a NetGear firewall/router box which is passing PPTP VPN
> packets
> through to the server.
>
> This is the exact same setup that I configured on the old Windows 2000
> Terminal Server, but now the VPN connection is extremely unreliable. I've
> configured network connections on both Mac OS X and Windows XP clients. I
> connect to the VPN, and I can connect remotely for between 4.5 to 6.5
> minutes
> (sometimes more, sometimes less), and then the connection hangs. On the
> Windows client it appears to disconnect, but the Mac OS X client still
> "appears connected", but the connection is effectively dead. If I
> disconnect
> and reconnect, I can get another 4.5 - 6.5 minutes of connectivity.
>
> Any ideas? How can troubleshoot this? This used to work fine on the old
> hardware.