HTTP Error 503. The service is unavailable.

We are upgrading from version 7.11 to version 7.12.  The server instances, application, mobile were built using the same port numbers used in the current 7.11 production environment.  The APM Manager shows the services and browsing to the two application servers renders the web pages.  However, when clicking the URL for the mobile instance, the HTTP Error 503 is displayed. 

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