Problem - The FastCGI pool queue is full

Question

I am encountering a problem where the following error is reported:

The FastCGI pool queue is full

Why would this be and how can I fix it?

Answer 1

You could try increasing the FastCGI "Queue Length" for your PHP CGI application.

Launch IIS Manager and open the FastCGI settings feature by double clicking on it:

Select your PHP CGI application (the path may be slightly different from the one shown below), click Edit on the RHS pane. This will open a dialogue where you can change the queue length:

The FastCGI queue length as described in the docs:

Specifies the maximum number of requests that can be queued for a FastCGI process pool. Acceptable values are in the range from 1 through 10000000. The default value is 1000.