Your Isp Seems To Be Enforcing a Firewall For Ur Net Connection......Hence Kazaa Sometimes may or may not connect......Using Http Tunnel Or others May not be of that much use to u as i have tried em myself and the Ports Cannot be opened to much extent Which Kazaa requires

.....U can try Out The Latest BitTorrent P2P TEchnology.......It has quite a few Advantages over these traditional P2P's.....Search The forum And Will Get Loads of thread on it and Kazaa As well (Including my own Post that i posted sometime back)