NIS slows Bareos backup to a crawl
I have a Centos 7 server running Bareos backup. I have a mixed network of Windows and Linux systems. If I backup a Windows 10 PC with NIS enabled the backup takes much more than 1 hour to backup 4-5GB data. If I disable Smart Firewall AND Auto-Protect it takes 4-5 minutes for the same backup. This is true on Windows 10 Pro, Windows 10 Pro Insider and Windows 10 Home.
The Bareos File-Daemon uses ports 9102 and 9103 which are both enabled in the NIS setup.
Any help would be very useful. If no help is forthcoming then I will abandon NIS (again) when my current subscription expires.