XAMPP - Port 80 in use by "Unable to open process" with PID 4! 12

user_3097839 0
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I have been trying to figure out how to fix this problem for two days. I'm new to this kind of thing so I would appreciate it if someone could tell me how to fix it.

I've tried deleting skype but that didn't work, I've tried turning off the world wide web thing off, IIS off nothing seems to work.

12:51:22 PM  [Apache]   Problem detected!
12:51:22 PM  [Apache]   Port 80 in use by "Unable to open process" with PID 4!
12:51:22 PM  [Apache]   Apache WILL NOT start without the configured ports free!
12:51:22 PM  [Apache]   You need to uninstall/disable/reconfigure the blocking application
12:51:22 PM  [Apache]   or reconfigure Apache and the Control Panel to listen on a different port
xampp apache windows
27 Answers

As there is comment by @johnkarka on the question, this port is used by SQL Server reporting service as well. After stopping this, Apache started fine.

  1. Go to "SQL Server Configuration Manager"
  2. Click on "SQL Server Reporting Service" and stop it

enter image description here

The funny thing is IIS was working fine in same configuration but not Apache, had to stop SQL Reporting service to make it work on default port (80).

user_7779820

After changing the main port 80 to 8080 you have to update the port in the control panel: enter image description here Then click here: enter image description here And here: enter image description here Then save and restart.

user_44257720

In windows 10, to free up port 80:

in my case, I open "Services" from "Search Windows" (on the left corner on screen), then stop all of SQL server services MSSQLSERVER and it works again

user_44214510

I have the same issue, I solved the problem, just disabled

"BranchCache Service" in services.

Somehow windows updates, this service is triggered in startup, and uses 80 ports. When you check via netstat you could see the system is used this but couldnt understand which service is used.

user_6219510

For those with ASP.NET, C# or having SQL Server users, If you are using SQlServer OR Visual Studio Your port might encounter. easiest thing you might want to do is on Command> servies.msc and then find SQl Server Reporting Service and then stop it.

user_47720550

I had same issue. After some googling arrived to this page. Since I guess this error may have various reasons, so listen to my experience:

Xampp red line log: 

12:53:54 PM  [Apache] Problem detected!
12:53:54 PM  [Apache]   Port 443 in use by "Unable to open process" with PID 3908!
...

Finally it turned out that I had this line of code in my php codes :

$res = file_get_contents("http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]");

The purpose of this piece of code was to get a mirror of php result from somewhere in my server. But it's just stucked in a loop that gets its own content!

I repaired code:

$res = file_get_contents(str_replace("my_uri.php" , "mirror_uri.php" , "http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]"));

Then I restarted apache ... and that apache error never happened again.

So sometimes searching for probable halting points in your code is a good approach.

user_26803430

In Ubuntu by default, the system will not allow you to occupy privileged ports [ 0 to 1023], other than specifying the port as 80, you need to run XAMP with sudo.

user_78629090
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