I am having similar problems to the guy above.

I'll be as clear about my setup as possible, because from teh looks of it alot of people are experiencing similar problems.

Right i'm connected to the internet via a network running a NAT. It has support for upnp.

I have added javaw.exe to my firewall trusted app list and i know for certain that it is not blocking anything.

I launch limewire and it just sits on 'Connecting' forever, it never connects.
I only have 1 green light. I can see the connection attempts to peers being made in the connections window, however they seem to all be timing out as in they can't make a direct connection to me.

I have managed to get port-forwarding working alright even though i'm behing a nat, using UPNP (bit torrent works fine with azureus and the upnp plugin, using the log i can watch everything that's going on, and find the ports that have been setup to go to my machine's lan ip)

Anyway when i go to
http://www3.limewire.com:6346/

"The connection was refused when attempting to contact www3.limewire.com:6346."

When i use telnet i get the following:

C>telnet www3.limewire.com 6346
Connecting To www3.limewire.com...Could not open connection to the host, on port
6346: Connect failed

I have been reading these forums for hours trying everything i can, including removing .limewire configuration files etc, i have even tried using an HTTP proxy and reconnecting, but then it just tells me that limewire can't detect an internet connection.

What else can i try?