You can try the following settings it has worked with Symantec Backup Exec 11d

• We configured the NAS in Windows (PDC)
• The Backup agent was set to none. When enabled we ran in to problems backing up data on the NAS.
• Not sure if this is required but we made the Backup Exec service account a superuser
• We configured the Backup Exec service account full access to the share that needs to be backed-up.

On the backup server:
• We used the Backup Selection option
• We Browsed the Domain
• We Browsed from the Domain to the NAS server
• We Browsed on the NAS to the share
• We created several data backup sets to create policies and jobs
• We found that for this NAS we had to select :
“Allow use of any available network interface, subnet, or protocol for remote agenets not bound to the above network interface, subnet, or protocol.”

I currently do not have an ETA for Symantec Backup Exec 11.5d