Hi , Sorry for asking this newbie question first. I am running a network with a Linux Server as a gateway. I am using IPtables as to masquerade internal IPs for Internet usage. I want to block the uses of my intranet for using yahoo messenger. I needed help for this. In general i wanted to know how to block a particular port. Thanks in Advance Alok Shukla __________________________________________________ Do you Yahoo!? Faith Hill - Exclusive Performances, Videos & More http://faith.yahoo.com