When using WatchGuard System Manager, it would be very helpful to be able to set the Default Authentication server (to say Active Directory) instead of it defaulting to Firebox-DB.
An enhancement request is open to allow the ability to select the default authentication server for WSM. The enhancement is being tracked as FBX-9050.
Juan Nakasone | Technical Support
WatchGuard Technologies, Inc. | www.watchguard.com
It appears that this is now a feature under the two drop-downs within Authentication > Settings