Routing problem with Win2k3 SP1

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We have a simple (two office) network set-up, LAN in UK office (Single subnet
192.168.1.0/24) and a LAN in French Office (Single subnet 192.168.2.0/24) all
XP Pro clients. These have been linked for 18 months, using dedicated Win2K3
RRAS servers (Demand Dial, Static Routes and Address Pool). Other Win2K3
servers handle AD, DNS etc. With SP1 for Win2k3 installed (on the RRAS
servers), everything looks OK (In RRAS Admin) however you cannot connect, or
Ping through the tunnel (to or from clients) it is possible to connect and
Ping from the RRAS servers to each other. I've used PING, PINGPATH, TRACERT,
ROUTE PRINT and NETDIAG there are no differences in their results, before or
after SP1.

If I take SP1 off, everything is fine again (nothing else is changed). I’ve
tried this many times over the last few days, with 3 different RRAS servers.
Always the same result. I think there may be an issue with SP1 here. There
seems to be a number of similar scenarios appearing on web communities
Regards Shudson

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