Synology Directory Server - not to be confused with Synology LDAP Server - is a Samba-based installable package for Synology. NADI has no official support for Samba but it has been tested successfully against Samba 4.12.14.

Setting up Synology Directory Server

Set up your domain as described in the official documentation.

Configuring NADI

When connecting NADI to Samba/SDS, you have to choose STARTTLS for the configuration option Environment/Use Encryption, otherwise you will receive the error AD: Strong(er) authentication required] [AD error code: 8 during verification of the connection].