i have a IIS 8.5 server with php 5.4.24. When request increase on my running site then huge CGI/FastCGI open and site become unreachable. site down and give 500 internal server ERROR. I have tried in many ways but problem remaining same. as per my observation only 2-3 process stay active . rest other process stay inactive and make the system slow. Is their any body can help me to figure it out the solution.
necessary configuration parameter is as below: in php.ini: