Same problem here :
Everything looks fine, connection tests are OK. GWEBcache queries are OK. Endless attempts to connect. No hosts in cache and absolutely no connection. Tried everything found in this forum.
Except for connection tests, Wireshark doesn't shows any incoming packet.
My ISP is Orange (France) . Are they blocking Shareaza ? I don't have any Orange crapware installed, AFAK.
Shareaza 2.3 used to work well but I didn't use it for a while. (I've had that no-connection experience with 2.4, on another computer)
Having now no-connection with 2.3 either, I decided to upgrade and... here I am. (On the verge on giving up with gnutella.)