If you have a software firewall try removing the exeption for limewire.exe that you had before and adding a new one

If that doesn't work

Try deleting the Limewire preference folder while Limewire is closed. (Remember to take a note of the settings because you will have to set Limewire up from scratch) More on this in this Thread + some other fixes

Fixes for Limewire when LW isn't operating as it should