error: x509 certificate signed by unknown authority when logging in OpenShift 4 after replacing API certificate

Solution Verified - Updated -

Issue

  • API certificate has been replaced and now oc loginfails with the next error:
$ oc login https://api.cluster.domain.tld:6443
error: x509: certificate signed by unknown authority
  • Adding the CA in the command line doesn't help:
$ oc login --certificate-authority=ca-cert.pem https://api.cluster.domain.tld:6443
error: x509: certificate signed by unknown authority

Environment

  • Red Hat OpenShift Container Platform
    • 4.x

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