Openshift Services Network Failures on ports 22623 and 22624

Solution Verified - Updated -

Issue

The ovn-kubernetes and openshift-sdn rules to block access to the MCS were accidentally interfering with (replies to) connections that happened to pick (randomly and deliberate) 22623 or 22624 as the source port.
This can cause the appearance of network failures, example failed automated testing that picks random ports.

Environment

Red Hat Openshift Container Platform 4.3
Red Hat Openshift Container Platform 4.4
Red Hat Openshift Container Platform 4.5
Red Hat Openshift Container Platform 4.6

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