root@FeistySmurf:~# netstat -lnp | grep '0.0.0.0:80'
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN     2137/httpd          
root@FeistySmurf:~# ps                       
  PID TTY          TIME CMD
 2420 pts/0    00:00:00 bash
 2705 pts/0    00:00:00 ps
root@FeistySmurf:~# /etc/init.d/apache2 start
 * Starting web server (apache2)...
apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName
(98)Address already in use: make_sock: could not bind to address 0.0.0.0:80
no listening sockets available, shutting down
Unable to open logs
   ...fail!
root@FeistySmurf:~# /etc/init.d/apache2 restart
 * Forcing reload of web server (apache2)...
apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName
httpd (no pid file) not running
...