[spencer]

You will get the answer for this error message, if you go to your Server > Administrative Tools>Event Viewer>There will be following W3SVC-WP (IIS6) error messages:

- Could not load all ISAPI filters for site/service. Therefore startup aborted
or
- The HTTP Filter DLL C:\WINDOWS\System32\RpcProxy\RpcProxy.dll failed to load. The data is the error.

Resolution for the error:

1) You’ll need to do following two things,
Web Sites->Properties-> remove ISAPI filters & disable this filter in Web Server Extensions).
then restart IIS.

2) Now again check the logs and look for the following appear:

a) The identity of application pool 'mydomain.com(pool)' is invalid,
the World Wide Web Publishing Service can not create a worker process to serve the application pool. Therefore, the application pool has been disabled.

This is root cause of "service unavailable"

b) A failure was encountered while launching the process serving application pool 'mydomain.com(pool)'. The application pool has been disabled.


For this, you’ll need to reset password for user IUSR_mydomain.com serving the application pool of mydomain.com, set the same values for identities of Web Sites->domain.com and Application Pools->domain.com(pool).

Now restart this application pool for mydomain.com and it’d now work without errors. :dancing: