I've set up everything by the book (tutorials) Initial Server Setup with Ubuntu 12.04 How To Protect SSH with fail2ban on Ubuntu 12.04 How To Set Up a Firewall Using IP Tables on Ubuntu 12.04 How To Install Linux, Apache, MySQL, PHP (LAMP) stack on Ubuntu and at the end of everything, just when I thought it's all over, when I needed to reload apache, I get this error:

* Reloading web server config apache2                                                             
 /usr/sbin/apache2ctl: 87: ulimit: error setting limit (Operation not permitted)
httpd not running, trying to start
(13)Permission denied: make_sock: could not bind to address 0.0.0.0:80
no listening sockets available, shutting down
Unable to open logs
Action 'graceful' failed.

and when I run sudo netstat -ltnp | grep ':80' i get:

tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      4266/apache2

Where did I go wrong, what should I do ?