QNAP TS-401T Turbo Server User Manual page 143

4. Go to Access Control in Network Share Management to configure the access
control right of domain users for all available network shares.
Using domain users to access services
To access services like FTP, Network Neighborhood, or Apple Talk with an domain
user account, add DomainName\ before the user name when logging in.
Note: To join AD domain again, set TS-401T as standalone server in
Microsoft Networking section. Make sure all domain users are removed
in User Management before joining TS-401T to AD domain.
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