[ASP] Fix "Debugger not working - Authentication error occurred..."

Coding... coding... and press F5 to debug it...
The message show: "Debugger not working - Authentication error occurred while communicating with the web server" and you can't continue your work!

Some error similar
"Unable to start debugging on the web server. An authentication error occurred while communicating with the web server"
"Error while trying to run project. Unable to start debugging on the web server."

What problems?
Try check some one:
1. Are you register asp.net to IIS?
- Delete the ASPNET account
- Using commad line go to ASP.NET IIS Registration Tool and type "aspnet_regiis -i"
Read more at: http://msdn.microsoft.com/en-us/library/k6h9cz8h(VS.80).aspx

2. If you using old system: IIS6, Visual Studio 2008,...
Please read this article: http://support.microsoft.com/kb/896861