If you have XP, then disable the XP firewall. You shouldn't have 2 firewalls running together. They'll clash & may even result is less security. Here's a couple of links to see about Zone Alarm: 1. Connection Problem- Zonealarm, 2. Zonealarm

If that's not the issue, you may want to try deleting your LW Preferences folder whilst LW is closed; instructions here: Point #2 in Fixes for Limewire (sample image included.) This sometimes refreshes LW's abilities. But make note about any important option settings b/c once you delete the LW prefs folder, you'll need to reset them.