Apache Address already in use: Unable to bind port 80, please choose another one.

1) Find out what are the open ports and established TCP connections:
$ netstat -vatn
2) Make sure port 80/443 is not used by any other service:
# netstat -tulpn| grep :80
3) If port 80 is bind to httpd, kill all process:
# killall -9 httpd

Reference: source.


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