If you're having difficulty connecting to games with the just-released Unreal Tournament demo, there's a post to the Unreal Technology Page explaining why (thanks caudwell). Here's the scoop:

It's been reported to me that the ftp2.heat.net server, the PCGamer (futuregamer.com) and Next-Generation download sites do NOT have the correct version.

The correct version of the .exe file is called UTDemo3dfx.exe and is 51,305,472 bytes. I have updated the in-game news page to inform users of the incorrect version (Version 321) that they are not running the right version, and to let me know. The 321 version was the version we sent to 3dfx before Hurricane Floyd hit Raleigh, as a potential release candidate should the hurricane have knocked us out for a few days.