At the first sight the question looks similar to this one.
I have experienced an odd behavior while trying to copy a certain file from Windows Server 2008 R2 network share to Windows XP Professional client via VPN. The VPN was set up using RRAS on the server machine. I will try to provide as much informations as possible in order to make the issue more clear.

When trying to copy the compressed file sized ~2.5 MB (via Explorer or CMD, doesn't matter), the process stalls after some 20%, producing an error message after few seconds:

Cannot copy filename: The specified network name is no longer available.

If i start the command ping -t 192.168.2.1 (where the IP address specified belongs to the server) side by side with the copy command, I can clearly see that the ping command times out for few seconds as the copy process stalls. When this happens all network activities are frozen. After a few seconds, the network recovers, ping continues to run normally, however the copy process stands still before it displays the above error message.

Copying other files (I tried 4-5 files), of which some are larger and some are smaller, succeeds. Seems to me that I can copy all uncompressed files. As soon as I try to copy an archive, the process freezes. Even a 707 KB large archive can't be copied.

I can only reproduce this behavior on 2 machines, both Windows XP Professional, one is w/ SP2 and the other w/ SP3. Other XP clients don't have this problem, neither do Windows 7 clients.

If I connect to the server using Remote Desktop Connection without using VPN from either of these 2 machines (using the same user account), I can copy anything I want normally, even these "problematic" files.

Does anyone have any clue about what could possibly be going on?