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Published Sep. 10, 2025

Restarting JBoss node hangs at JGroups.connect() when using multicast

Written By

Zalán Szakolci

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Issue

  • If I have a multinode cluster using multicast replication, and I set  
    multicast.group.address["cluster-link-udp"]
  • Restarting a node sometimes hangs when initializing JGroups channels.

Environment

  • Liferay DXP 7.1
  • JBoss EAP 7.1
  • Multicast replication

Resolution

  • Eliminate the line from your portal-ext.properties:  
    multicast.group.address["cluster-link-udp"]
    So that Liferay will use its default IPs and collision won't appear.
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