I had tried all the other suggestions before manually disconnecting, then reconnecting. Using Windows Explorer, located the directory (I believe it is in the folder Documents and Settings/USer/limewire - check suggestion in other threads as to the excact location). Left click on the folder once to highlight it, then right click once to open an options window. The delete command is near the bottom.

Also, someone had posted a suggestion to add two site addresses and ports. You should be able to add these addresses via the Connection Tab, use the 'add' button at the bottom.

Lastly, you may want to shut LW down and restart it before trying the Disconnect/Connect suggestion.