I am encountering a 503 – Service Unavailable error. I checked the event log and found this:
The Module name FastCgiModule path
C:\WINDOWS\System32\inetsrv\iisfcgi.dll
returned an error from registration.
The data is the error.
Note: Every time I try to visit my website, I found that the DefaultAppPool will auto-stop.
And also found this in event log:
Application pool 'DefaultAppPool' is
being automatically disabled due to a
series of failures in the process(es)
serving that application pool.
Best Answer
This is because your application pool is crashing more than 5 times in 5 minutes [default settings - Rapid Fail]
Instead of disabling Rapid Fail, you should consider taking Crash Dumps and try to find out the root cause. http://blogs.msdn.com/b/rahulso/archive/2006/03/02/what-is-a-crash-technically-in-asp-net-and-what-to-do-if-it-happens.aspx