Thanks! Saved me some trouble. The 1.23 one works fine; it just adds this to your registry:

[HKEY_LOCAL_MACHINE\SOFTWARE\Epic MegaGames\Jazz Jackrabbit 2\1.23\List Servers]
"000"="jazz.contrabandent.com"

The TSF one should work, but you don't need all those other keys for different versions in there, nor the list.jazzjackrabbit.com entry. Perhaps you could edit it to remove those superfluous entries?