the easiest way to fix it would be
1. check what name the command `hostname` spits out
2. make sure that /etc/hosts contains that hostname and IP address
or you could go the other way
http://tomcat.apache.org/tomcat-6.0-doc/config/cluster-receiver.html
look for the address attribute
see the http
my bad i forgot to add the definitions of my server.xml
managerClassName="org.apache.catalina.cluster.session.D
expireSessionsOnShutdown="false" useDirtyFlag="true">
className="org.apache.catalina.cluster.mcast.McastService"
mcastAddr="228.0.0.4"