Instance creation fails with 'Stderr: iptables-restore v1.4.21: unknown protocol "ipencap" specified' in Red Hat OpenStack Platform

Solution In Progress - Updated -

Issue

Instance creation fails with 'Stderr: iptables-restore v1.4.21: unknown protocol "ipencap" specified' in Red Hat OpenStack Platform

The neutron openvswitch agent log shows error messages similar to the following:

(...)
2019-01-16 14:33:27.521 449233 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent -I neutron-openvswi-PREROUTING 34 -m physdev --physdev-in qvbb761fc92-c9 -m comment --comment "Set zone for fc92-c92e-4761-b1d3-316174ab7386" -j CT --zone 29
2019-01-16 14:33:27.521 449233 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent -I neutron-openvswi-PREROUTING 35 -i qvbb761fc92-c9 -m comment --comment "Set zone for fc92-c92e-4761-b1d3-316174ab7386" -j CT --zone 29
2019-01-16 14:33:27.521 449233 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent -I neutron-openvswi-PREROUTING 36 -m physdev --physdev-in tapb761fc92-c9 -m comment --comment "Set zone for fc92-c92e-4761-b1d3-316174ab7386" -j CT --zone 29
2019-01-16 14:33:27.521 449233 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent COMMIT
2019-01-16 14:33:27.521 449233 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent # Completed by iptables_manager
2019-01-16 14:33:27.521 449233 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent ; Stdout: ; Stderr: iptables-restore v1.4.21: unknown protocol "ipencap" specified
2019-01-16 14:33:27.521 449233 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent Error occurred at line: 44
2019-01-16 14:33:27.521 449233 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent Try `iptables-restore -h' or 'iptables-restore --help' for more information.
2019-01-16 14:33:27.521 449233 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent 
2019-01-16 14:33:27.521 449233 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
(...)

Environment

Red Hat OpenStack Platform 10 - 13

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