Port 80 is being used by SYSTEM (PID 4), what is that?

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There are many services, which can listen port 80 on windows.

Luckily you can detect and stop them all running simple console command:

NET stop HTTP

When you’ll start it, you will get list first:
enter image description here

To avoid this problem in future go to Local Services and disable listed services.

N.B. – Some services will restart themselves immediately, just run ‘NET stop HTTP’ few times.

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