IIS Authentication Required Dialog Working?

1. Open Firefox
2. In the address bar type: about:config
3. Firefox3.x and later requires you to agree that you will proceed with caution.
4. After the config page loads, in the filter box type: network.automatic
5. * Modify network.automatic-ntlm-auth.trusted-uris by double clicking the row and enter 127.0.01 or localhost or your desire site address
6. * Multiple sites can be added by comma delimiting them such as http://www.yoursite.com, http://www.mysite.com

Unexpected Error 0x8ffe2740 Occurred in IIS 5.1

IIS Use port 80 by default and skype also use same port so if we want to remove this error we can change the skype port 80 to other.

Hurray! IIS now working