Windows and anonymous authentication on IIS 7.5, allow auto login for internal and manual login for external

To allow anonymous authentication on IIS 7.5 and enable automatic login for internal users and manual login for external users, you can follow these steps:

1. Open the IIS Manager.
2. In the left pane, expand the server and click on the site for which you want to enable anonymous authentication.
3. In the main pane, under the “IIS” section, double-click on the “Authentication” icon.
4. In the “Authentication” pane, select “Anonymous Authentication” and click “Edit” in the right pane.
5. In the “Edit Anonymous Authentication Credentials” dialog, select the “Specific user” option and enter the username and password of the account that you want to use for anonymous authentication.
6. Click “OK” to save the changes.

This will enable anonymous authentication for your site, and allow internal users to access the site without being prompted for a username and password. External users will still be prompted for a username and password when accessing the site.