JGroups, TCP_NIO multiple messages sent to nowhere

Question

Messages sent to ports I never specified in my configuration file.

this is my config:

[10-Jan-2011 11:02:22.917 GMT] ERROR org.jgroups.protocols.TCP_NIO  - failed sending message to 192.168.50.41:8851 (116 bytes): java.lang.Exception: connection to 192.168.50.41:8851 could not be established
[10-Jan-2011 11:02:22.917 GMT] WARN  org.jgroups.blocks.ConnectionTableNIO  - Connection is not running, discarding message

Answer 1

Because you have a port_range of 2, so every discovery message is sent to all of the initial_hosts defined in TCPPING, plus port_range, e.g.

TCPPING.initial_hosts=A[1000],B[1000]
port_range=2

will send discovery requests to A:1000-1002, B:1000-1002.

TCPPING is used at startup for initial discovery and by MERGE2 (not in your stack)...