To configure DNS for automatic discovery of ISA Server

1. Click Start, point to All Programs, point to Administrative Tools, and then click DNS.
2. In the console tree, right-click the applicable forward lookup zone and click New Alias.

   Where?

   • DNS
   • DNS server
   • Forward Lookup Zones
   • Applicable zone
3. In Alias name, type WPAD.
4. In Fully qualified name for target host, type the fully qualified domain name of the ISA Server computer or array.

Notes

• If DNS does not appear in Administrative Tools, it is not installed.
• If the ISA Server computer or array already has a host (A) record defined, you can click Browse to search the DNS namespace for the ISA Server or array name.
• When using DNS to publish WPAD, automatic discovery must be configured to use port 80. Alternatively, the outgoing Web requests must be configured to listen on port 80.

To configure DHCP for automatic discovery of ISA Server

1. Click Start, point to All Programs, point to Administrative Tools, and then click DHCP.
2. In the console tree, right-click the applicable DHCP server, click Set Predefined Options, and then click Add.
3. In Name, type WPAD.
4. In Code, type 252.
5. In Data type, select String and then click OK.
6. In String, type:

   http://Computer_Name:AutoDiscoveryPortNumber/Wpad.dat
   
   where Computer_Name is the fully qualified domain name of the ISA Server computer or array and AutoDiscoveryPortNumber is the port number on which automatic discovery information is published. This port is either the outgoing Web request port number or an additional port used for automatic discovery publishing.

7. Right-click Server options, and then click Configure options.
8. Confirm that the Option 252 check box is selected.