CodeReady Workspaces fails to start CRW server, ERRORS say 'KUBE_PING'

Issue

CodeReady Workspaces does not install and start. The CRW log shows lines like this:

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GMS: address=codeready-f894cf6db-k2ssd-8119, cluster=RemoteSubscriptionChannel, physical address=172.12.34.143:7800
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2020-02-24 17:25:10,627[f6db-k2w9d-8919]  [ERROR] [org.jgroups.protocols.TCP 99]        - JGRP000029: codeready-f894cf6db-k222-8119: failed sending message to 172.12.34.143:7802 (161 bytes): java.net.ConnectException: Connection refused (Connection refused), headers: KUBE_PING: [GET_MBRS_REQ cluster=RemoteSubscriptionChannel initial_discovery=true], TP: [cluster=RemoteSubscriptionChannel]

A successful environment has different logging:

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GMS: address=codeready-fc9686c7-abcd-6zk9-6129, cluster=RemoteSubscriptionChannel, physical address=10.12.34.29:7800
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2020-02-24 18:54:12,114[ost-startStop-1]  [DEBUG] [o.j.p.k.s.BaseStreamProvider 15]     - TokenStreamProvider opening connection: url [https://172.12.34.1:443/api/v1/namespaces/workspaces/pods?labelSelector=app%3Dcodeready%2Ccomponent%3Dcodeready], headers [{Authorization=Bearer eyJhbGciOiJSUzI1NiIsImtpZCI6IiJ9.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5..........