rgmanager "error #37: Error receiving header" in RHEL 6

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Issue

rgmanager is showing errors like this in the logs:

Jul  2 07:07:00 node1 rgmanager[23072]: #37: Error receiving header from 5 sz=0 CTX 0xe10400
Jul  2 07:07:08 node1 rgmanager[23072]: #37: Error receiving header from 5 sz=0 CTX 0xe10400

Environment

Red Hat Enterprise Linux Server 6 (with the High Availability Add on)
rgmanager prior to release 3.0.12.1-12.el6

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