How to Fix XAMPP Apache - Port 80 in use by "Unable to open process" with PID 4

apache not starting in XAMPP, how to fix xampp apache not running How to Fix Apache - Port 80 in use by "Unable to open process" with PID 4 in XAMPP In this tutorial I will show you 2 ways that you can fix this error, the first is by disable the world wide web publishing service and the second is by changing the ports in the con fig files located in Xampp within Apache. Apache WILL NOT start without the configured ports free! You need to uninstall/disable/reconfigure the blocking application or reconfigure Apache and the Control Panel to listen on a different port. Apache Server is not starting and you are using XAMPP