User ' IIS apppool\*** ' logon failed

The user ' IIS Apppool\defaultapppool ' logon failed.
I have IIS installed in the WINDOWS8
Then I added the website I made.
Prompt user ' IIS Apppool\defaultapppool ' logon failed after opening.

I can run normally in vs2010.
Best answer this is a setup issue for setting up IIS application pools.
I was confronted with such a problem.

For example, my site named MyWeb, will default to you to create a myweb application pool
HTTP 404.17 error At the beginning of the report

Solution:
1. Right-myweb The application pool, basic settings, select the. NET Framework version, see there are two, 2.0, and 4.0.
Ah, when I see it, I choose 4.0.

And then I'm going to report your mistake.
' IIS apppool\defaultapppool ' login failed.
This is because the user authentication mode of your IIS application pool differs from the authentication mode of SQL Server. Remember which mode you chose when installing SQL Server? Mine is LocalSystem (if you forget, try each one)
OK, let's solve the problem next.

2. Again right-myweb the application pool, advanced settings, see that there is a node called "Process Model", modify the marked one, for
LocalSystem. Get.

Turn on your website.