I know how you can fix that do these following steps:

1.)type in regedit the the run box (in the start menu)
2.)Go to HKEY_LOCAL_MACHINE
3.)then Software
4.)Then Epic megagames
5.) Click on any of the jazz programs 1.23 or 1.24 and where it says the listervers put in this: jazz.nimrod-online.com

It works cuz im able to play now yay thx who ever said that (i have a bad memory) xp