nova list runs into ClientException error and doesn't returns any output

Solution Verified - Updated -

Issue

  • On the director node nova list doesn't returns the list of nova instances and errors with the following message:
    ERROR (ClientException): The server has either erred or is incapable of performing the requested operation.(HTTP 500)

Environment

  • Red Hat OpenStack Platform 9,10
  • RHEL 7.x

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