X-NDS_NEVER_SYNC is an Extended Flags and one of the EDirectory Extended LDAP Flags

When set this indicates this is a Non-replicated attribute and prevented from synchronizing with other replicas. The information in the attribute is specific to the Edirectory Replica. (ie current server)

The X-NDS_NEVER_SYNC implies that this attribute is Not Synchronized to other members of the Partition.

When not set, changes to the attribute are synchronized to other replicas.

In NDAP, this is equivalent to the DS_PER_REPLICA flag set to True.

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