system
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Hi goobster,
You can add a packet rule in the avast! Firewall, to access your drive through UNC path. For that go to,
avast! GUI → Firewall → Firewall Settings → Expert Settings → Policies → Packet Rules(on bottom right) → Check the Windows Networking In and Windows Networking Out. → Click on OK.
Try to access the drive and report back. Hope you will be able to access it.
Have a wonderful day. Good Karma! 