How do I stop httpd running under Mac OS X (10.11) El Capitan Server?

You can stop that with command:

sudo apachectl stop

The apple proxy service is the service that grabs ports 80 and 443, so you need to stop that one.

sudo launchctl unload -w /Applications/Server.app/Contents/ServerRoot/System/Library/LaunchDaemons/com.apple.serviceproxy.plist

This command should kill them all:

sudo killall httpd

They will start again on next boot.

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