VPN users losing connection to exchange server

I have a VPN issue that has been plaguing one of my clients and wondered if you have ever dealt with it.  I have users connecting to a Windows 2003 server via MS VPN (PPTP).  They are having issues, where they ‘lose’ the connection.  When I say lose I mean they are still connected through VPN, but the connection to the Exchange server quits (‘Trying to reconnect to the Exchange server”).  By disconnecting the VPN and reestablishing it all seems to work for a while.  There doesn’t seem to be any consistent time frame that causes this (i.e. – sometimes is after 45 minutes, sometimes after a few hours, sometimes a few minutes, sometime not at all).  This is happening for all users (about 10 of them), they are located across the US and have different ISPs and equipment.
BlakeISSAsked:
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Alan HardistyCo-OwnerCommented:
If you don't need VPN for files, then quit using VPN for Exchange and configure HTTP over RPC and then your users can use Outlook as if they were sitting next to the server.

To set it up, please read the following:
http://www.petri.co.il/how-can-i-configure-rpc-over-https-on-exchange-2003-single-server-scenario.htm or

http://www.amset.info/exchange/rpc-http.asp 
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BlakeISSAuthor Commented:
Check your MTU settings, a VPN connection will encapsulate the packet and add an extra header – this may be putting you over the 1500 bytes and therefore dropping the packets.
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BlakeISSAuthor Commented:
Really looking to solve this issue in place and not try to do a round-about fix.  This is a new issue so I will report back with logs and such ..
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Alan HardistyCo-OwnerCommented:
Do your users only use VPN to access the Exchange server?
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BlakeISSAuthor Commented:
No, use it for connecting in as well.
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Alan HardistyCo-OwnerCommented:
Okay - thanks for confirming that.
Have you tried disabling / re-enabling the VPN on the server as the first line of attack for this problem?
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BlakeISSAuthor Commented:
I will try this and report back. Thank you!
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Alan HardistyCo-OwnerCommented:
Just in case you are not sure - I am referring to RRAS.  Disable it, then re-enable it by running the wizard, but choose the manual option, then choose VPN and complete the wizard.
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BlakeISSAuthor Commented:
alanhardisty,
Sorry got tied up with other projects and neglected to check back. thank you I will try this and report back!
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Alan HardistyCo-OwnerCommented:
No problems - I know what you mean - it happens to me from time to time ; )
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BlakeISSAuthor Commented:
Users do use the connection to access the exchange server. Giving you the points because of the suggestion to use owa and get them an alternate means for connecting.
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