Application pool ' DefaultAppPool ' is automatically disabled

Reload the system, deploy a Web site today to display Service Unavailable error

Google a bit, solved, the following solution to the method:

1. First, open IIS Manager. Check the application pool, and sure enough, "DefaultAppPool" went wrong. And not the usual stop icon.

2. Try to focus on the "DefaultAppPool" application pool, but it didn't take long for the program pool to go wrong again.

3. It's time to view the event log. The following types of logs were found

Event Type: Warning
Event Source: W3SVC
Event Type: None
Event id:1009
Date: 2008-6-24
Event: 16:12:33
Users: N/A
Computer: MAIL
Describe:
The process providing service for application pool ' DefaultAppPool ' terminated unexpectedly. The process ID is ' 3160 '. The process exit code is ' 0xFFFFFFFF '.

For more information, see the Help and Support Center in http://go.microsoft.com/fwlink/events.asp.

4. Will not be the default program pool problem. So, try creating a new pool of programs. Change the default Web site's program pool to new. But the problem remains. A similar log appears.

Event Type: Error
Event Source: W3SVC
Event Type: None
Event id:1002
Date: 2008-6-25
Event: 14:17:04
Users: N/A
Computer: MAIL
Describe:
The application pool ' AppPool #1 ' was automatically disabled because of a series of errors in the process that serviced the application pool.

For more information, see the Help and Support Center in http://go.microsoft.com/fwlink/events.asp.

5. Look up the event log another log caught my attention. As follows:

Event Type: Error
Event Source: DCOM
Event Type: None
Event id:10016
Date: 2008-6-24
Event: 16:12:33
User: NT authority/network SERVICE
Computer: MAIL
Describe:
Application-specific permission settings do not include COM server applications (CLSID as
{a9e69610-b80d-11d0-b9b9-00a0c922e750}
The user NT authority/network SERVICE SID (s-1-5-20) is granted the local activation permission. You can use the Component Services Administration tool to modify this security permission.

For more information, see the Help and Support Center in http://go.microsoft.com/fwlink/events.asp.

6. It's a bit of a play. See the CLSID for {a9e69610-b80d-11d0-b9b9-00a0c922e750} is what service first. Finally, find it in the following registry key:

HKEY_CLASSES_ROOT/APPID/{A9E69610-B80D-11D0-B9B9-00A0C922E750}

7. The name happens to be "IIS Admin Service"

8. Well, find out what it is. To open Component Services from Administrative Tools, locate the IIS Admin service to compare the CLSID to the same

9. After confirming this, the next step is to increase the network service privileges for it.
A start and activate permissions, click "Custom".

B. Add "Network SERVICE" to the list of users,

C. and give local start and activate permissions, save exit.

To solve this problem.