Management interfaces are down, controller is up, 504 gateway timeout in Red Hat OpenStack Platform

Solution In Progress - Updated -

Issue

Due to an outage on specific NICs, a controller's management interfaces are down. While the controller is still up, it cannot be reached for management. Since this happened, it seems that the controller is blackholing traffic that is routed towards it via haproxy.

Environment

Red Hat OpenStack Platform 10

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