VPN error 718 timeout while server event viewer grants user access

In the middle of the day the VPN from clients attaching to the SBS 2003

server stopped working. They are going through a cisco 1700 router and the

IAS points to the Cisco with a shared password and then uses windows AD to

authenticate. The event viewer shows the authentication has been approved

(user name etc.) but the remote client has a timeout error saying error 718

when verifying user name and password no timely response by the server. The

server is getting its DNS name resolution and email over a DSL line. When

people RDP directly to the separate Terminal Server they have no issue. That

is going over a cable line. We have rebooted the server and the router w/o

change. This has happened to people whether they have changed their password

or not. Has this issue been addressed by a SBS SP? Has this issue arisen

for anyone. Thank you.

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SFeder