Service Unavailable when deploying an ASMX Service

I deployed an ASMX service to a newly configured machine.
When I open the ASMX, I get the dreaded Service Unavailable error.



looking at the system log, I see this entry:

Event Type: Error
Event Source: DCOM
Event Category: None
Event ID: 10016
Date: 8/29/2007
Time: 8:35:35 AM
User: NT AUTHORITY\NETWORK SERVICE
Computer: CONTOSOQABTS
Description:
The application-specific permission settings do not grant Local Activation permission for the COM Server application with CLSID
{A9E69610-B80D-11D0-B9B9-00A0C922E750}
to the user NT AUTHORITY\NETWORK SERVICE SID (S-1-5-20). This security permission can be modified using the Component Services administrative tool.

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

all of the IIS settings seems fine. When I set the DefaultAppPool to the administrator account, I get this other error:

Event Type: Warning
Event Source: W3SVC
Event Category: None
Event ID: 1057
Date: 8/29/2007
Time: 9:14:43 AM
User: N/A
Computer: TAMSQABIZTALK
Description:
The identity of application pool 'DefaultAppPool' is invalid, so the World Wide Web Publishing Service can not create a worker process to serve the application pool. Therefore, the application pool has been disabled.

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

Then Dan found this article on MSDN that seems to solve this issue. Basically, you need to add the account that the application pool is running under to the IIS_WPG [IIS Worker Process Group].