Configuring ClusterCATS Failover on Apache Web-Servers Running ColdFusion 4.5.1
Problem: ClusterCATS failover won't work when Apache is configured with or
without multiple hardware virtual servers under a single instance on Linux or
Solaris, unless you manually configure the virtual servers in the Apache
httpd.conf file to listen on the IP addresses of their cluster-mates.
Solution: This article gives instructions on how to set up your httpd.conf file
to get around this problem.
Source: Article 16363