IIS 7 and Above
FastCGI problems make PHP-sites crash running in IIS 10
Re: FastCGI problems make PHP-sites crash running in IIS 10
Dec 01, 2017 06:48 AM|Yuk Ding|LINK
First of all, you need to check whether both application pool identity(IIS Apppool\<apppoolname> and authenticated user like IUSR has the read/write permission to access the files. Secondly , you could try to grant permission to the c:\windows\temp. You
could use php -v to check whether the PHP configuration has been configured correctly.
If the steps above not working, maybe it is not an IIS fast-cgi configuration error but an application error in IIS fast-cgi pipeline. So maybe you need to check your PHP code or consult the PHP forum.