Everyone just use Monolith's list server.
Go to HKey_Local_Machine\Software\Epic Megames\Jazz Jackrabbit 2\1.23\List Servers in your registry and make monolith.idlegames.com the value data of one of the strings (000, 001, or 002). This will work even if you have Alberto's patch; just add a string value named 000 with data monolith.idlegames.com.

I heard from Spazzyman that Burger is just replacing the logicware list server (with a better one), so the logicware list server will be back up soon, no worries.