In our case, the event disappears with service Backup Exec Remote Agent restart.
Check the default gateway, the DNS or route for the connection to Internet or Exchange server.
This event is logged when trying to start the Blackberry Dispatcher service after you just removed the license keys offline (osql -E on database BesMgmt). Start all other keys that are set to Automatic, start BlackBerry Manager, add the license key, and then start the Dispatcher.
See the links to "BlackBerry Support Article Number: KB-02068", "BlackBerry Support Article Number: KB-03771", "BlackBerry Support Article Number: KB-03995", "BlackBerry Support Article Number: KB-03966", and "Understanding Events on the BlackBerry Enterprise Server that Affect Service" for information on fixing this problem.
In my case the event was caused by a down server. Login is secured by protocols such as SRP (Session Request Protocol). You might notice delays in receiving messages. It is also possible that messages sent from the BlackBerry may be returned. Returned messages should be resent once the SRP connection has been restored.
See the link to "How to troubleshoot SRP connectivity issues" for details on this problem.