SBS 2003 server, SP2 & all patches. VPN client access has been working fine for two or three years. Now, without any recent changes, updtaes, patches, VPN clients cannot connect.
The server logs RASMAN error 20209:
Event Type: Warning
Event Source: Rasman
Event Category: None
Event ID: 20209
Time: 8:04:28 PM
A connection between the VPN server and the VPN client xxx.xxx.xxx.xxxhas been established, but the VPN connection cannot be completed. The most common cause for this is that a firewall or router between the VPN server and the VPN client is not configured to allow Generic Routing Encapsulation (GRE) packets (protocol 47). Verify that the firewalls and routers between your VPN server and the Internet allow GRE packets. Make sure the firewalls and routers on the user's network are also configured to allow GRE packets. If the problem persists, have the user contact the Internet service provider (ISP) to determine whether the ISP might be blocking GRE packets.
Restarted the service & the server. Disabled & re-enabled remote access via the wizard. I can establish a VPN over the LAN, but not from the net. Tried from more than one client.
Changed the router, same deal.
I've got a bunch of sites in the same configuration with the same routers, no problem.