Right, then, I'll try Phex and see if that works... I mean, I've tried FrostWire and that doesn't seem to work either... If Phex works, I'll use it; if not, I'll contact my ISP and see if they have begun to block Gnutella...

Which would make some sense, because ISPs are supposed to start cracking down on "illegal" file downloads, and if blocking Gnutella does the trick, then I guess I could see why all Gnutella programs are failing.