If you see this error in your health check report, do the following:
Verify that your database is running.
Go to ADx installation directory and open the
Check that the database entries in the following properties are correct:
ADX_DEFAULT_DB_TYPE ADX_DEFAULT_DB_NAME ADX_DEFAULT_DB_HOST ADX_DEFAULT_DB_PORT ADX_DEFAULT_DB_USER
If you found a wrong entry or a typo, it't probably causing the error. Fix it, save the file, and restart ADx. Database should now be available.