openfire cluster cannot see other nodes

i've been trying to cluster openfire 3.7.1 servers on both ubuntu using clustering1.2.1_beta plugin and coherence 3.3.1. everything is ok except when  i enable the cluster ,i can see only one node, in nodes list , i cannot see other nodes? both hosts in clound server! In two hosts. 

/etc/hosts

  i set the inner ip

10.241.*.* AY130320174029486c6b
10.200.*.* AY121015030014a903417

http://community.igniterealtime.org/message/218486#218486  i follow this!

anybody has encounter this problem?

any suggestion/advice would be appreciated! thank you!