VPN timing out connecting to SBS 2003 R2 Standard

Whenever someone connects to the SBS 2003 R2 Standard server, after a period of time (eg 45 mins) they lose connection. The users have also been complaining of occasionally being unable to save opened doc and xls files back to the server (file locked) which I suspect is a symptom of the main cause.

I can connect to the server via Remote Desktop for long periods of time without incident.

There's nothing in the event log to suggest anything is up other than a brief run of RASMAN 20209 errors at a totally differnet point in the day.

Is there a connection timeout setting I'm missing or could something else be causing the problem?
Dale303Asked:
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clonga13Commented:
In the RAS service, check under Remote Access Policies. Right Click the Microsoft connections and click Edit Profile. The timeout settings are there,
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Dale303Author Commented:
Thanks for that. Well hidden I must say.

(Un)fortuantely, all looks normal there and nothing is ticked.

Is there anything else that might be causing the VPN to disconnect?

I did think it might have been the router having some sort of wobbly but the RD connection seems stable. Are VPN connections inherently more susceptable to router glitches or other connection issues?
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clonga13Commented:
I find VPN tunnels to be very reliable on their own. The only issues I come across is when there's an ISP issue, VPN needs a little help reestablishing. Does your server have ISA on it? It has it's own set of remote access policies that could be over riding the timeout settings. Is there a firewall between your server and the Internet?
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Dale303Author Commented:
I found a lot of issues with DHCP registrations, possibly due a corrupted database.

I  ran the "Change Server IP address" wizard and reentered the internal IP address which cleared up the issues with DHCP.  Since then VPN has been working fine too.

Thanks for helpinng me eliminate some possiblilities.
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