Attempt to upgrade fails with "Unable to retrieve available updates x509: certificate signed by unknown authority" in OCP 4

Solution Verified - Updated -


  • When attempting to upgrade the cluster by running oc adm upgrade or clicking to upgrade in the UI it fails with :
Could not retrieve updates. Unable to retrieve available updates: Get x509: certificate signed by unknown authority.
  • Doing curl to fails with:
curl: (7) Failed to connect to port 443: Connection refused


  • Red Hat OpenShift Container Platform (RHOCP) 4.X

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