# Set user database replication on or off for Firewalls and Master NGFW Engines

The internal user database on the Management Server is replicated automatically to Firewall engines and Master NGFW Engines.

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The engine uses the local copy of the internal user database to authenticate users without a connection to the Management Server. If you have a reason to do so, you can turn off the replication.

CAUTION:
If you want to prevent users from authenticating, remove the authentication settings of a user instead of turning off the replication. Turning off the replication prevents any new users you add after the operation from authenticating, but might not prevent existing users from doing so.

For more details about the product and how to configure features, click Help or press F1.

## Steps

Right-click a Single Firewall, Firewall Cluster, or Master NGFW Engine and select or deselect Options > User DB Replication.