Windows: Port 80 is already in use

I wanted to start the Apache web server using XAMPP and got an error message that port 80 was already in use. My first thought was that IIS might be running on port 80. But on this machine I hadn’t installed IIS. So I executed the following to check which process might be using it:

c:\> netstat -nabo
...
  TCP    [::]:80                [::]:0                 LISTENING       4
 Can not obtain ownership information
...

So it’s process ID 4. I also used TCPView from Sysinternals and also saw that the process ID 4 was using this port. The process name was shown as “System”. In Task Manager, the image name for process ID 4 was System and the description was “NT Kernel & System”. It didn’t help me much either.

So I went through the list of running services and saw a service called “Web Deployment Agent Service” with the description “Remote agent service for the Microsoft Web Deploy 3.5.”. After stopping this service I was able to start Apache on port 80 successfully.

You can check the services by pressing Windows-R to get to the Run prompt, typing services.msc and pressing enter.

If this doesn’t help, I’d recommend searching for a service called “World Wide Web Publishing Service” and stop it. And of course, if IIS is running, you should stop it.

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