Nixie155: There's no central server on the Gnutella network. It's simply sharing b/w you, me & others. Have a think about anything you've installed recently on your system(s). Hope you didn't install SP2 b/c you don't need it & it may cause you big headaches! Do you lot use a router? If so what brand name & model no. is it? Many Routers block many ports for incoming.

Try updating your Java: Java 1.4.2 (click on link)