I found that connections to a Windows 2000 Server VPN from Mac OS X 10.2.8 or 10.3 were all failing to negotiate. I could connect to the VPN via VirtualPC with MS Windows running on the same computer.
The solution turned out for me to apply firmware 1.44 to my Linksys BEFSX41. The most recent version (1.45.3) of the firmware apparently does something to prevent the VPN from working on the Mac.
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