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VPN, delayed write, and Rasman hang

Last Modified: 2012-05-10
I have a Windows 2003 server with the following setup:
- a connection to a remote  server (Windows 2008 R2) using a PPTP VPN.
- I am then mounting a remote share, mapping to a drive letter.
- The remote share contains a large TrueCrypt volume file, which I am then mounting using TrueCrypt, mapping to another drive letter.
- A process (PHP) executes xcopy to copy files periodically to the mounted secure volume.

This works great, sometimes for several days, until at some seemingly "random" point I get an NTFS delayed write failure in the event log, followed by a TrueCrypt error.

Once this has "broken", the PHP process continues generating these events (never recovers). At some point, the failure becomes terminal and the VPN connection drops.

Sometimes, the VPN connection can be redialed. However, often the RASMAN service is completely locked up, and won't respond to stop requests. At this point, the only thing I can do (I think) is reboot the machine.

There are no errors or unusual events reported at the remote (2008) server end.

Any suggestions as to what's going on would be very helpful.
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