You might need to get a fresh gnutella.net file. The preferences folder for OS 9 is found at:
Macintosh HD/System Folder/Preferences/.limewire .. if you list it into list view you should find the folder at or near the top of the preferences folder.
To find a fresh gnutella.net file, see either bottom of this post:
If LW 4 Will Not Connect (click on the blue link) or else, here
http://www.gnutellaforums.com/343558-post10.html