SBS 2003 all patches were current, except for SP2. This weekend, I put on SP2. (Box has one NIC, and goes through a bridge router, and Fortinet Firewall, and has been working just peachy for 8 months. No changes to firewall or router for months.)
After SP2, and reboot, no more VPN access, but could still OWA into box to get mail. Windows Firewall is NOT running, there is no ISA installed, so where and what do I look for to see why Error 800 is present from remote client after the reboot required by SP2?
Check RRAS is still setup correctly, perhaps re-running ICW or manually setting RRAS incase there's an error with the IP settings.
Can you connect via VPN inside the network? If you can connect inside the network then start looking at the perimeter settings, check the vpns' GRE is enabled. There's a remote possibility that post SP2 the UPNP changed the settings in the router / firewall box and blocked VPN.
Terry
SP2 broke some network cards - do a search on this site, or Susan Bradley's blog to get the answers - as well as the support.microsoft.com and blogs.technet.com/sbs sites.
ttfn
David
(c)David Overton 2006-23