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# Cluster communication port (must be the same on all member servers). There
# is no need to open this port in the firewall as csf will automatically add
# in and out bound rules to allow communication between cluster members
CLUSTER_PORT = "7777"
I din't install version 6.27 and went directly from 6.26 to 6.28? Could that be the issue?
P.S. Then I tried to change it as I saw the error but it was just the same error!?