Syed Tipu Ali asked... ______________________________________________________________________ I want to block .exe or .mp3 files. How can I do so? right now I m using ISA server with client Address Sets. ______________________________________________________________________ Go to the KB article at the following link. You will need to get the hotfix from Microsoft (it is free and easy to get). http://support.microsoft.com/default.aspx?scid=kb;en-us;813864 After that, if you still need help, let me know. I recently implemented this and it works perfectly. Fred ______________________________ Frederic Giroux LAN Administrator CyberCap fgiroux@xxxxxxxxxxxxxx http://www.cybercap.qc.ca 33 Prince St. Suite 301 Montreal, Qc H3C 2M7 (514) 861-7700 ext. 303 Fax : (514) 861-7700