Thank you very much for the reply..but the problem was different.

The problem was I have the Check Point firewall in my system and it was blocking, but somehow other applications could overrode it. When I tried shutting down the firewall, it still didnt work, and I found out there is one more service is running at the background preventing it.

So finally I reinstalled the firewall and now I am able to connect.

Thanks every much for everyone who has responsed.

Regards