Have just fixed my connection problem with Limewire, Not been able to connect at all since I re-installed it a couple of weeks back after I bought a new hardrive.
I know it wasn't my hardware as I plugged in my old drive and Limewire connected ok.
Tried all the advice with going into options and unblocking the firewall and stuff with no result.
Then I found it was with the latest Java I had installed was interfering with Limewire.
**Solution**
First un-install Java then un-install Limewire. Restart PC. Re-install Limewire.
It worked for me.
Hopes this helps other people..
Maybe this solution should be stickied so it doesn't get lost in time.