There are 2 ISA servers that are at the same point subnet on the network so there will be redundancy if one crashes or needs to be rebooted. I tried accessing the Internet from a computer that was not joined to the domain and received and authentication prompt as expected, but instead of one prompt, there were 4 prompts 2 password prompts for each ISA server.
There is KB about this issue but it is from 2004 and the instructions on where the settings are do not apply:
http://support.microsoft.com/kb/822458
Microsoft ISA Server
If you use Microsoft Internet Security and Acceleration (ISA) Server, follow these steps to configure the downstream ISA Server-based server to pass credentials upstream:- Click Start, point to All Programs, point to Microsoft ISA Server, and then click ISA Management.
- Expand Servers and Arrays, expand <var>Your_Server_Name</var>, expand Network Configuration, and then expand Routing.
- Right-click the routing rule that you want to configure, and then click Properties.
- Click the Action tab, click Routing them to a specified upstream server, and then click Settings.
- In the Server or array box, type the name or the IP address of the upstream server.
- In the Port box, type the port number that the upstream server uses to listen for Hypertext Transfer Protocol (HTTP) requests. Typically, this is port 8080.
- In the SSL Port box, type the port number that the upstream server uses to listen for Secure Sockets Layer (SSL) requests. Typically, this is port 8443.
- Click OK two times.
I tried following that, but the options are different now.
Is there something similar to fix this issue for ISA 2006?