可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试):

问题:

I want to run MAMP on my Windows 8.1 pc, but when I start the servers, it says:

'APACHE' needs open port '80' which is already being used by another 
service or application. Please reconfigure 'APACHE' to use free port.

Changing the port to something else doesn't help.

回答1:

when you have this problem just turn off Skype because Skype use port 80

回答2:

I used kampageddon's answer and it worked. Just follow the following steps:

Run MAMP
Click Preferences
On Preference window click Ports
While on Ports change Apache & Nginx Port to 8080.
click ok
Start Servers.

回答3:

Start windows command line and then run netstat -aon | findstr :80 You will see line with process that is using port 80

回答4:

I also found this post - https://superuser.com/questions/960023/port-80-already-in-use-after-windows-10-upgrade - suggesting disabling the IIS service, which worked perfectly for me

回答5:

You can change MAMP ports in Preferences -> ports, like a screenshot below

回答6:

Hey On Windows 10 I Ran into the same issue.. I found a way that is a guarantee fix... Go into controlpanel -> system security -> windows firewall -> on the left pane there is advanced settings.. click that. -> then add new inbound rule (on the left pane click inbound... then new rule on the right pane.) -> then follow the wizard as program and select mamp from C:/MAMP I believe. Then you are Golden!! Hope this helps all those out there with the new windows 10. Hypertextie

回答7:

If you arrived here because you just installed MAMP on a Windows OS (7~10), then Microsoft IIS is the most likely culprit hanging on to port 80.

You can confirm that with the CLI netstat advice by Sergio below and should you find via netstat that a listening service has a process id that maps to NT Kernal & System (ntoskrnl.exe -> cross check via details tab in task manager) then the culprit is IIS.

To Turn off IIS;

Start menu -> Control Panel -> Programs & Features -> Turn Windows Features On or Off -> De-select 'Internet Information Services'.

If you know why IIS is running then you will likely know the application that specifically needs it and you can turn back on when need (take note of the selection chain when turning off) -- otherwise it's unlikely you need IIS on.

回答8:

I had the same problem with recent windows update. Closing skype did the trick.

回答9:

Thru some web searches, I discovered that other windows services are know to be using Port 80. In Windows Search (via Windows Start), type 'services', stop one of these services below en test again till it works. Do not forget to restart it later !