If u are saying to do this way---> OPTIONS > >PREFERENCES > CONNECTION and then changing the "PORT USED FOR INCOMMING CONNECTIONS" value to 80
Then it might no help him, coz if he is using any blocking s/ware such as PEER Guardian then it will disallow the use of connections from HTTP.. coz it allows only TCP adn UDP connections) DEFAULT is "HTTP DISABLE" in PEER GUARDIAN
@ Dinesh: It might well be the case with ur ISP (coz as u said that the torrent d/loads work okay at day time) so u better check up witht eh BSNL ppl office..
Cheers n e-peace...