thanx buddy, you've mentioned "Telnet must be enabled on your machine, the attacker must have a username and password as well". well would you plz tell me the detail of this plz. I m using windows98 and logon using default user without any password. I don't have any port blocker installed. again i repeat from conneting through telnet i don't mean to connect to some server like www.yahoo.com, instead i meant if anyone is able to connect with my pc using telnet. Can he connect at any open port using telnet, or there is a single port associated with my system, and plz explain me what do you mean by "attacker must have a user name and password". i'll wait for answer. and thanx for such help.