Thanks mate,I appreciate the trouble you've taken.

I set up a static IP and port forward over a year ago,and rechecked the settings only yesterday.

I now think the problem may have been a compatibility issue between my router and Comodo Firewall.--I uninstalled Comodo,and installed Zone Alarm,according to the instructions. Shareaza is now working perfectly.----I've connected,disconnected,turned of and on and rebooted the PC and the router,twice now..--I could get the connection to work with Comodo if I rebooted the router (?)

I will of course keep your reply for future reference.

Thanks again