Windows Server 2003. I gave permissionsto the ASPNET Temporary files and that cleared the last error. The site comes up now for a user who is already logged in (but they cannot log out). Unfortunately, for a user who is not logged in and uses this link to get to the site:

http://<DotNetNuke_Install>/DesktopModules/AuthenticationServices/ActiveDirectory/WindowsSignin.aspx

They get a Windows log in prompt. When they attempt to log in (using the format - domainname\username) the screen does not bring up the site but flashes between "waiting for servername" to "redirecting to site..." but the site does not come up.

I checked and the site (our Intranet) is in the Trusted Sites List (also per the documentation you pointed me to).

When the user tries to log out they're taken back to the same page they were on and auto-logged in. Basically, the page just does a refresh and the user is never given the option to log out as they are not logged out.

Here's the authentication portion of my web.config:

<!-- Forms or Windows authentication -->

  <!-- <authentication mode="Forms">
      <forms name=".DOTNETNUKE" protection="All" timeout="60" cookieless="UseCookies"/>
    </authentication> -->
   
     <identity impersonate="true" userName="DomainName\DNNAccount" password="AccountPassword" />
    <authentication mode="Windows">
    </authentication>

Thanks again for all your help.