You seem to have done the right things. Make a note of all your LW settings. Then close LW. Then go to your Preferences folder & put it in list mode. Find LW's Prefs called .limewire (it should be at the top of the prefs folder list.) Trash it! Now try opening LW again. You'll need to rest all your LW options again. This sometimes does the trick.

What brand of modem & routers are you using & what are their model no.'s?

Go here: http://www3.limewire.com:6346/ What does it do? (it should say Test page was a success.)

I'm not sure about your other settings. I haven't used the Classic LW since version 2 which I used in OS 8.5 up to 8 months ago. Let me install your version in OS 9 & I'll get back to you. (Luckily I just finished some other time consuming processes in OSX.)