FastCGI process has failed frequently recently - for WP on IIS 7.5

Question

We have a Windows 2008 R2 server. We have hosted WordPress website on it. The website shows 500 internal error frequently. On enabling the detail mode, it gave the following message:

HTTP Error 500.0 - Internal Server Error The FastCGI process has failed frequently recently. Try the request again in a while.

Resetting the server starts the website.

The issue has been quite often and we are unable to find any further information regarding the cause. Neither we are able to replicate the issue.

We have enabled sysloging in php.ini but to no avail.

Answer 1

It's difficult without log verbosity, but I had the same issue. You can see if this works for you:

Try maximizing your "Instance MaxRequest" in your FASTCGI Configuration.

IIS root > FastCGI Settings : Thenchoose php-cgi.exe for WP, then edit and increase the Instance MaxRequests