This scenario assumes that the BlackBerry® Enterprise Server is available and has an active connection to a BlackBerry MDS Connection Service that is running, but the health score of the BlackBerry MDS Connection Service fell below the failover threshold.

1. The BlackBerry Dispatcher sends a request to a BlackBerry MDS Connection Service with an acceptable health score to promote its standby connection to an active connection.
2. The BlackBerry MDS Connection Service with the acceptable health score promotes the connection to active.
3. The BlackBerry Dispatcher sends a request to the BlackBerry MDS Connection Service with the low health score to demote the active connection to a standby connection.
4. When the BlackBerry MDS Connection Service with the low health score receives the request, it finishes processing the packets that the BlackBerry Dispatcher sent to it previously.
5. The BlackBerry MDS Connection Service with the low health score checks whether the standby BlackBerry Enterprise Server was promoted to the primary instance. In this scenario, it has not.
6. The BlackBerry MDS Connection Service with the low health score opens all IPPP sessions and sends error messages to open sessions.
7. The BlackBerry MDS Connection Service with a low health score sends a message to all open sessions to log out.
8. The BlackBerry MDS Connection Service with the active connection sends a message to all open sessions to log in.