- name: "ExternalNameServiceTypeInvalidPortName"
    code: IST0150
    level: Warning
    description: "Proxy may prevent tcp named ports and unmatched traffic for ports serving TCP protocol from being forwarded correctly for ExternalName services."
    template: "Port name for ExternalName service is invalid. Proxy may prevent tcp named ports and unmatched traffic for ports serving TCP protocol from being forwarded correctly"

                  This also means that the Gateway must have at least one non-conflicting
                  Listener in this case, otherwise it violates the requirement that at
                  least one Listener must be present.


                  The implementation MUST set a "ListenersNotValid" condition on the
                  Gateway Status when the Gateway contains Conflicted Listeners whether or