VPN works but only for one user at a time?!?!

If have ISA at main office config'd to accept VPN connections. It and RRAS
SEEM to be setup correctly. Verified by reading thru this article
(http://www.isaserver.org/pages/article.asp?id=232). Any user from remote
office can VPN in and work...but only one at a time. When the second user
VPNs in he can work for a few minutes but then mysteriously loses the
connection. I turned on Max Logging and see entries saying the
disconnected user was disconneted by his request. <(EXCERPT FORM EventVwr)The 
user SECG\foti connected on port VPN4-8 on 09/26/2002 at 07:26pm and 
disconnected on 09/26/2002 at 07:28pm.  The user was active for 2 minutes 5 
seconds.  94900 bytes were sent and 94582 bytes were received. The port speed 
was 10000000.  The reason for disconnecting was user request.>

How can I troubleshoot this further?
Thanks inadvance.
Foti

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