Port 443 in use by "Unable to open process" with PID 4
Similarly, I experienced this: Port 443 in use by "Unable to open process" with PID 6012! When starting XAMPP Control Panel v3.2.1 for the first time.
In Task Manager I found that PID 6012 was Apache web server. A copy of it was running in the background without the GUI, and when I invoked the GUI it was trying to start another copy. Killed the phantom copy and then XAMPP started up fine.
I didn't have to change any port settings.
I had the same problem: port-443-in-use-by-unable-to-open-process-with-pid-4
First I disabled the weather tile in Win* that apparently phones home to Redmond for updates after this showed on netstat list.
This didn't solve the problem. I looked at the post already here which mentioned VPNs, so
I went to Control Panel\Network and Internet\Network and Sharing Center
and clicked on Change adapter settings
I clicked on Incoming Connections
and right clicked on properties
The VPN click box at the bottom of the General
tab was on, so I unchecked it
Under Users
, I also unchecked a previous user I had allowed to copy some data weeks before
Then I clicked okay
Closed the control panel and restarted the XAMPP control panel
It fired right up without a problem.
Just change the sll port in httpd-ssl.conf file. It would be under C:\xampp\apache\conf\extra. Find "443" and replace it with other values(e.g 8181), then start your apache again