We run a few internal applications that are addressed using a FQDN:

http://site.domain.com/our_app

The applications are also available through the server name:

http://site/our_app

We’ve had a strange issue with one of our applications that requires ‘Integrated Security’ authentication.

A few of our users, who run IE6 (because that’s what they are forced to use) get prompted for credentials.

You’d assume that since IE knows who the user is, that it would simply provide it to the application, and it would allow access.

I’ve done a little digging at it would seem we are not the only people with this issue.

• FQDN name verses server name
• URL with FQDN is asking for authentication

It would seem that this is a browser, rather than application related issue:

• Internet Explorer May Prompt You for a Password
• Intranet site is identified as an Internet site when you use an FQDN or an IP address

Best explanation award foes to Windows IT Pro:

• Preventing IIS from Prompting for User Credentials

It would seem the only short term solution is to provide the fix to the user community before we can update group policy (if this is possible!)

SC