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To allow connections from clients running previous versions of Firewall Client
In the console tree of ISA Server Management, click General.
In the details pane, click Define Firewall Client Settings.
On the Connection tab, click Allow non-encrypted Firewall client connections.
Note
To open ISA Server Management, click Start, point to All Programs, point to Microsoft ISA Server, and then click ISA Server Management.
For ISA Server 2006 Enterprise Edition, expand Microsoft Internet Security and Acceleration Server 2006, expand Arrays, expand Array_Name, expand Configuration, and then click General.
For ISA Server 2006 Standard Edition, expand Microsoft Internet Security and Acceleration Server 2006, expand Server_Name, expand Configuration, and then click General.
Important
When you select this option, computers running earlier versions of Firewall Client software are allowed to connect. Also, any Firewall client running Microsoft Windows NT Server 4.0, Windows Millennium Edition, or Windows 98 can connect.
When you select this option, non-encrypted traffic from authenticated users will be blocked. Users are only authenticated if firewall policy rules specifically require authentication.