Red Hat Knowledgebase

1. When starting httpd, it returns the error message:

   "Address already in use: make_sock: could not bind to address [::]:80"
   

2. netstat shows an unidentified process listening on port 80:

   tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN -

Solution:
Make sure that the tux service is not running. It will not show up in the result of the command ps but the command service tux status will show if it is running.

Tux is a kernel-based high performance HTTP server. To turn it off, execute the following commands:

service tux stop
chkconfig tux off

Now try starting Apache and it should succeed otherwise, continue troubleshooting.