The ultimate test is to make a 1.24 or 1.23+ with multiversion on server and set the name: Super Cool New Test (or hotel) by gus

If nobody joins within 10 seconds it is a technical problem.

I dont know if you know but you should forward the ports 10052 udp/tcp and 10054 udp/tcp. If this doesnt work you are one of the many ppl that have more difficult technical problems.

If you really want to host you could try to find your problem at this site: http://www.simpleportforwarding.com/

If that didnt worked or if you dont know much about the subject make a post at this forum: http://forums.pcwintech.com/

You will be helped in no-time there