Yes. You guys should really give more information. What OS, do you have a router or firewall etc.

The most common problem seems to be that routers/firewalls block the port that gnutella uses.

If you know how to set up your router/firewall, set it to forward port 6346 to your local IP.

I hope this makes sense.

Have you tried the FAQ?

http://www.limewire.com/index.jsp/faqs#Firewall