When starting/re-starting Apache, you get the following error message:

Starting httpd: (98)Address already in use: make_sock: could not bind to address 0.0.0.0:80/443
no listening sockets available, shutting down
Unable to open logs!

To fix the problem, run the following commands

• /bin/netstat -lnp | grep '0.0.0.0:80'

The output might be:

tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 21426/tux

Now, to see what service with the PID 30982, run this command:

• ps 21426

The output might be:

PID TTY      STAT   TIME COMMAND
21426 ?        S      0:00 /usr/local/tux

As you can see, the service tux is using Port 80 and blocking httpd. All you need to do is stop tux and then restart httpd.