Unable to add worker node in OpenShift Container Platform 4 due to outdated mirror registry configuration

Issue

• Unable to add worker nodes in a disconnected OpenShift Container Platform (OCP) environment
• Encountering an error during the creation process as the base iso image cannot be pulled.
• The node-joiner pod that is created for this process fails to pull the necessary RHCOS ISO image from the private mirror registry.

time=2025-06-12T13:20:49Z level=fatal msg=failed to fetch Agent Installer ISO: failed to fetch dependency of "Agent Installer ISO": failed to fetch dependency of "Agent Installer Artifacts": failed to generate asset "BaseIso Image": failed to get base ISO image: failed to download base ISO image https://rhcos.mirror.openshift.com/art/storage/prod/streams/4.17-9.4/builds/417.94.202410090854-0/x86_64/rhcos-417.94.202410090854-0-live.x86_64.iso: Get "https://rhcos.mirror.openshift.com/art/storage/prod/streams/4.17-9.4/builds/417.94.202410090854-0/x86_64/rhcos-417.94.202410090854-0-live.x86_64.iso": dial tcp: lookup rhcos.mirror.openshift.com on 192.168.x.x:53: read udp 192.168.x.x:59685->192.168.x.x:53: i/o timeout

• Logs from the node-joiner pod show errors related to an invalid or incorrect mirror registry, or a 403 Forbidden error when attempting to reach an external registry. The process is "stuck" because the cluster is trying to fetch an image from an outdated source.

I0627 16:45:15.791498 2027102 create.go:479] Running command on pod openshift-node-joiner-fgfbf/node-joiner-zpbsk: [cat /assets/exit_code]
I0627 16:45:15.822962 2027102 fallback.go:56] RemoteCommand fallback: unable to upgrade streaming request: websocket: bad handshake (403 Forbidden)
2025-06-27T16:45:46Z [node-image create] unexpected error caught while running the command, storing pod logs in report
2025-06-27T16:45:46Z [node-image create] command execution failed. Reason: error caught while executing remote command: Internal error occurred: error executing command in container: container is not created or running. Error output: cat: /assets/exit_code: No such file or directory