Cox might be your problem. They are reknown as p2p blockers or perhaps it's only LW. They may have detected you sharing a lot of files & downloading a lot & decided to put the brakes on you by putting a special p2p filter/shaper/blocker in place.

Are you using LW Pro? If yes, try uninstalling Java & reverting back to Java 1.5 (take the JRE)

Otherwise, try deleting your LW Preferences folder whilst LW is closed; instructions here: Point #2 & 3 in Fixes for Limewire (sample image included at bottom of page.)

I have moved your thread. It was in general windows section.