My guess would be that your ISP has started shaping your Internet connection since you are able to connect to 6346. You can try deleting the .limewire folder but I do not know if it will help or not check with your ISP and see if they have started limiting P2P networks also you may want to try different ports some people that are being blocked or limited by the ISP are able to bypass it by going to ports between 50,000 and 62,000.
http://www.gnutellaforums.com/showth...threadid=36420