QNAP Disk On-line Server NAS-2100 User Manual page 110

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, Apple Talk with an domain
user account, add DomainName\ before the user name when logging in.
Note:
To join AD domain again, set NAS as standalone server in Microsoft Networking
section. Make sure all domain users are removed in User Management before
joining NAS to AD domain.
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