This solution applies to Barracuda SSL VPNs, all firmware versions.
The Barracuda SSL VPN requires an Active Directory account to use for caching the list of users and groups from the directory. This account serves as a link to your Active Directory database. If the Service Account is not found on your AD database then the Barracuda SSL VPN server will not be able to use AD. We recommend that an account is created specifically for this task.
This account only needs access to read AD objects if using the standard Active Directory database configuration, but it would need to be either a domain admin or have delegated permission to change passwords if the Enhanced Active Directory database is configured.
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