Why Am I Seeing an Internal Server Error when Accessing My Tower UI?

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Issue

When accessing the Tower web UI, there is an internal server error displayed and log file shows error as below:

django.db.utils.OperationalError: could not connect to server: Connection refused
    Is the server running on host "postgresdb.example.local" (10.10.10.10) and accepting
    TCP/IP connections on port 5432?

Environment

Ansible Tower

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