If you want to get rid of the annoying login prompt when starting AX if you have EP installed. Follow this two step solution:
- Start Server Manager. Go to Local Server and IE Enhanced Security Configuration. Turn it off. You might have to log out and in again for this to take effect.
- Start an AX client. Go to SysAdmin\Setup\EP\Web sites. Copy the address at the bottom of the form. Open it in a browser. There is a button for it in the right part of the form. To the top left, click Site Actions and Site Access. Add your user and give it access to the site.
Now you can open AX without getting harassed by a login prompt each time.