Integrated authentication and IE proxy settings

Hello,

I'm investigating how to connect our application to the external website
from the network with ISA configured as proxy with the authentication mode=
Integrated and "Require all user to authenticate" checked. I tested my
configuration from the Internet Explorer.

1. If "Automatically detect setting" option is checked on the internet
options dialog in IE, then the browser connects to external sites without
any problem. In the ISA log I can see that my requests went through and were
authenticated under my domain user name.

2. If I uncheck "Automatically detect setting" and check "Use a proxy server
..." option, and provide the server name in the text box, then whenever I try
to access internet, IE prompts me for my user name/password. ISA log shows
attempts to anonymously access external website.

My question is - why the behavior is so different for these two options in
the IE? Why it is asking me for credentials if I explicitly set the proxy
server?

Thank you,
Leonid.



.

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