Barracuda Networks NG Network Access Client SP4 Administrator's Manual page 177

Administrators of stand-alone Barracuda NG Firewalls can avoid making this decision - you simply
configure your trustzone within the
As a guideline for a simple setup using a CC, we recommend to use global trustzones or alternatively
switch to range trustzones.
For range or cluster based Access Control Services note that they can only reference trustzones within the same
administrative scope (not from another range/cluster).
175 Barracuda NG Network Access Client - Administrator's Guide
Access Control Service > Trustzone
node.