Hi, We have installed ISA server as a firewall and proxy server (integrated mode). All our outgoing traffic is pointed to ISA and if user based access is deployed my proxy is working fine only for web traffic. MSN Messenger, Yahoo Messenger and FTP traffic is not thru. We have checked with the permissions. If user based access is removed and any request is deployed it works fine. Can any one suggest how to overcome this issue so that my proxy ISA is well in place. Thanks in advance TPSN