Dave
I just replace the gnutella.net file and it works!!
You have only go to docum & settings, username, .limewire, delete the currently gnutella.net file, download a new one by locating in same subfolder (it's very important) and re-connect or re-start!!
These steps were from 'birdy'
Regards

Close LW. Make sure that it’s properly closed by opening Task Manager (ctrl+alt+del) & click on the Processes tab. If there’s a LW process running, end the process.

The link below will take you to a file hosting site where you can download a file named gnutella.net.
zSHARE - gnutella.net
If that link doesn't work, try this other one.
gnutella.net

Download that file & save it to your computer. Remember where you've saved the file to.

If you're using XP, look below.

Go to Control Panel > Folder Options > click on the View tab > put a dot in the circle next to ‘show hidden files and folders’ > apply > ok.

Go to Start > click on My Computer > double click on Documents and Settings > double click on the folder with your username > double click on Application Data. Now look for a folder named LimeWire. This folder named LimeWire is your preferences folder. You need to open the LimeWire folder by double clicking on it.

Once you’ve opened the LimeWire folder, look for a file named gnutella.net (or it may be named gnutella).

Delete that file. Leave the LimeWire folder open.
If there’s no file named gnutella.net or gnutella, don’t panic...you can put one into the folder.

Go & find the gnutella.net file that you downloaded earlier. Copy that gnutella.net file & paste it into the open LimeWire folder.

Close all folders, restart your computer & then start LW.