Unable to Start Debugging on the Web Server.

Dot .Net Dilemmas.
"Unable to start debugging on the web server. Debugging failed because integrated Windows authentication is not enabled."

Two possible solutions that have worked for me in the past:

Solution 1:
Start --> Control Panel --> Programs And Features --> Turn Windows features on or off



Select
Internet Information Server --> World Wide Web Services --> Security
Check
Windows Authentication


Be warned, this can take a LONG time to complete and you may think your PC has hung but stay with it.

Solution 2:

1. Open IIS 7. Click "Default web sites"
2. Under 'IIS' Click "Authentication"

3. Ensure that “Anonymous Authentication” and “Windows Authentication” are 'Enabled'.