We have a community member running Mattermost 5.3.1 in Kubernetes and receiving “Please check connection, Mattermost unreachable. If issue persists, ask administrator to check WebSocket port.” errors.
Chrome Developer Console shows websocket calls all have status „Finished“.
There‘s no proxy involved, but k8s ingress and service. config.json unchanged, regarding all WebSocket related entries (WebsocketURL „“, WebsocketSecurePort 443, WebsocketPort 80, ListenAdress „:8000“, SiteUrl set).
Does anyone have ideas on how to resolve the issue?