Why does nova fail creating instance with 'ports exceeded' error ?

Solution Verified - Updated -

Issue

  • Nova fails to create instances after a limited number of instances with the following error.
Error in creating instance: Maximum number of ports exceeded (HTTP 403)

Environment

  • Red Hat Enterprise Linux OpenStack 4.
  • Red Hat Enterprise Linux OpenStack 5.
  • Red Hat Enterprise Linux OpenStack 6.
  • Red Hat Enterprise Linux OpenStack 7.
  • Red Hat OpenStack 8.
  • Red Hat OpenStack 9.

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