In LimeWire, go to Tools > Options. On the "Network" tab, there is a section that says "Listen to Port:"
In this field, type 6346 ( this is the LimeWire default).

If this still doesn't work and LW gives you more error messages, such as incoming port not found or you are not being connected at all, download an alternate version of LW that might work for you from this location:

http://www9.limewire.com/download/LimeWire16d118.exe

Go here for more info about this:

http://www.gnutellaforums.com/showth...&threadid=2963