Hi Avi, The authentication breaks with MSN messenger like with Hotmail. There are several ways to solve the problem. One is to create an Access Rule that allows All Users access to the HTTP and HTTPS protocols to the followings locations: Config.messenger.msn.com Gateway.messenger.hotmail.com Loginnet.passport.net 207.46.110.0/24 (Subnet) Note that the last entry is a Subnet Network Object. Put that rule above any authenticated access rules that apply to the HTTP or HTTPS protocol and away you go. :-) Thanks for the question -- I wasn't going to put this in the book but I'm writing up the complete details now and will be in chapter 7, along with the complete answer and demo for blocking MSN Messenger without blocking hotmail by using an HTTP Security Filter signature. Thanks! Tom www.isaserver.org/shinder Tom and Deb Shinder's Configuring ISA Server 2004 http://tinyurl.com/3xqb7 MVP -- ISA Firewalls -----Original Message----- From: Avi [mailto:avip@xxxxxxxxxxx] Sent: Thursday, November 18, 2004 10:08 AM To: [ISAserver.org Discussion List] Subject: [isalist] Messenger VIA ISA 2000 http://www.ISAserver.org Hi again, I want to permit all my users to be able to use MSN Messenger. I have opened all ports acording to this link : http://www.isaserver.org/articles/MSN-ISAserver.html But I'm able to open messenger only when I install the firewall client. Thanks ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: World of Windows Networking: http://www.windowsnetworking.com Leading Network Software Directory: http://www.serverfiles.com No.1 Exchange Server Resource Site: http://www.msexchange.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this ISAserver.org Discussion List as: tshinder@xxxxxxxxxxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=isalist Report abuse to listadmin@xxxxxxxxxxxxx