Description of problem:
Default AJP Proxy setup defined in /etc/tomcat6/server.xml says:

<Connector port="8009" protocol="AJP/1.3" redirectPort="8443"
URIEncoding="UTF-8" address="127.0.0.1" />

which will cause the connector to listen at an IPv4-mapped IPv6 address
::ffff:127.0.0.1:8009

Corresponding rewrite rule defined /etc/httpd/conf.d/zz-spacewalk-www.conf:

<IfModule proxy_ajp_module>
RewriteRule ^/rhn(.*) ajp://localhost:8009/rhn$1 [P]
RewriteRule ^(/.*\.(do|jsp)(\?.*)?)$ ajp://localhost:8009/$1 [P]
</IfModule>

In an IPv6 only environment Apache will resolve localhost as ::1 -> apache
will never be able to connect to tomcat -> java part of Satellite will
never work.

Version-Release number of selected component (if applicable):
spacewalk-setup-1.2.6-11

How reproducible:
Always

Steps to Reproduce:
1. Install Satellite 5.4.1 in an IPv6 only environment
2. Try to create first user in webui
3. Check /var/log/httpd/error_log
  
Actual results:
Lots of errors like the following:

[error] proxy: AJP: failed to make connection to backend: localhost
[error] (111)Connection refused: proxy: AJP: attempt to connect to [::1]:8009 
(*) failed

Apache is unable to connect to tomcat.

Expected results:
No errors like the above, Apache is able to connect to tomcat.

Additional info:
The straightforward fix would be to add the following line to server.xml:

<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" 
URIEncoding="UTF-8" address="::1" /> 

The above fix is tested and is also required for a successful Satellite IPv6
installation and operation.