Apache Address already in use: make_sock: could not bind to port 80 error and solution
First make sure port 80/443 is not used by any other service or application with netstat command:
# netstat -tulpn| grep :80
If port 80 is bind to httpd, kill all process:
# killall -9 httpd
Now start the httpd:
# /etc/init.d/httpd start
Also make sure you are root while starting the httpd.