Binding Apache to a Specific Or Secondary IP Address

Apache, by default, will attempt to bind to and listen on these interfaces:

0.0.0.0:80
0.0.0.0:443

[::]:80
[::]:443

“0.0.0.0” specifies ALL IPv4 addresses that the system has (including 127.0.0.1).

“::” specifies ALL IPv6 addresses that the system has (including ::1).

When started, Apache will try to take all the IP addresses of the local system, and if you are already running another web-server (such as IIS, Tomcat, Nginx, Domino, etc) on that same system, Apache will not be able to bind to “0.0.0.0″ and “::”, and will fail to start.

To bind Apache to a specific or secondary IP address:

Edit file -
C:\WampDeveloper\Config\Apache\httpd.conf

Find and replace these two lines (one is at the beginning, the other at the end) -

Listen 80
...
Listen 443

With -

Listen ip.address.here:80
...
Listen ip.address.here:443

Also make sure that your other web-server is binding only to a specific IP address, and not to “0.0.0.0″.

If Apache won’t start, check the configuration by running (from the command line):

httpd -t -n "Apache2"
httpd -k start -n "Apache2"