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Originally posted by simon b:
We are currently have the following configuration set up.

Client XP -> IWSS 2.0 -> ISA 2000 Sp2 -> Internet

The client PC uses the webproxy client and either Ie6 or Firefox, IWSS is installed on it's own Server running Windows 2003, ISA 2000 runs on a dedicated server running win2k with sp4. IWSS is configured to work in dependent mode with ISA as it's proxy.

When accessing a web page for the first time, the browser prompts for a user name and password. If a the correct credentials are used the web page will be displayed. If cancel is clicked in response to the prompt for credentials, the an 407 is displayed. If the browsers refresh button is clicked, the web page will then display without a prompt or without the need to enter a userid or password.

It is then possible to use the browser for several minutes accessing multiple pages before another prompt for a userid and password appears.

We've sniffed the traffic from the client and have observed a sequence of events like the following.

1) Get http:// url.... client -> iwss + isa
2) 407 unauthorised iwss -> client
3) Get http:// url.... client -> iwss + isa
4) 407 unauthorised iwss -> client
5) Get http:// url.... client -> iwss + isa
6) 407 Proxy authentication required. The ISA server requires authorisation to fulfill the request. Access to the web proxy service is denied. Proxy connection closed.

Incidentally, we have also tried this with ISA 2004 and get similiar results.

I have had a good look through my copy of the ISA 2000 book but still can't pin point the cause.

If anyone has had similar problems or can point me in the right direction it would be much appreciated.

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