Document URL: https://access.redhat.com/documentation/en-US/JBoss_Enterprise_Application_Platform/6.3/html/Administration_and_Configuration_Guide/Configure_the_JGroups_Subsystem_to_Use_TCP.html Section Number and Name: 19.4.2. Configure the JGroups Subsystem to Use TCP Describe the issue: port_range is initialport + port_range, as explained here http://www.jgroups.org/manual/html/user-advanced.html Suggestions for improvement: Additionally, the description of the initial_hosts property in the EAP documentation is incomplete/misleading: "A comma-separated list of the hosts which are considered well-known, and will be available to look up the initial membership." The value of the initial_hosts property includes a host *and* port using the syntax: host[port]. The port_range applies to each address specified in initial_hosts. The end result is that the port_range effectively multiplies the set of potential initial members. e.g. if initial_hosts="host1[1000],host2[2000]" and port_range="2", TCPPING will try to contact the following addresses when the channel is connected: host1:1000, host1:1001, host1:1002, host2:2000, host2:2001, host2:2002 Additional information: