IIS external accesibility issue resolved

For those of you trying to figure out why IIS asks for username and password when you try to access it from Firefox, or a remote server, here's the solution:

1. Go to Control Panel > Administrative Tools > Internet Information Services > (local computer) > Default website
2. Right click and select Properties
3. Under Directory Security tab > Anonymous access and authentication protocol section > click on the Edit button
4. Check (select) Anonymous access (that is, enable it)
5. Leave other things unchanged
6. Click OK all the way out.
7. Restart your server
8. Done !