A bit of and odd one this but I am casting my net wider. We have a VPN running between two Vigor routers and we had a NAS running on truenas core with SMB shares. All worked well. We have recently migrated from truenas core to scale and the smb shares are no longer available  over the VPN network. Any pointers would be useful. All other resources including another NAS  (not a truenas) are all available.