Ask your provider if he is blocking or cutting your connection while you are using Limewire, ask for the port 6346. It might also be a bug, ask the developers:

bugs@limewire.com

Tell them exatly what happened. Give them infos about your OS, your provider, modem and which software you are using while running Limewire. And of course the version of Limewire you are using.

Morgwen