EAP 7 fails to join mod_cluster undertow balancer due to 405 responses to INFO MCMP requests

Solution Verified - Updated -

Issue

  • We're trying to run EAP 7 instances behind another EAP 7/undertow load balancer instance with mod_cluster. But the app server instances fail to join the balancer as their INFO requests get a 405 response:
MODCLUSTER000042: Error null sending INFO command

Environment

  • JBoss Enterprise Application Platform (EAP) 7.x
  • mod_cluster

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