NSM - How Synchronize Firewall works

When a firewall shows Online Unmanaged in NSM, it might show Out-of-Sync. Synchronize Firewall from NSM can resolve this. 

When clicking "Synchronize Firewall", NSM will forget whatever it has, and pull current running configuration from the firewall. This is "Read" process. It does not affect the production of the firewall.

The differences can be viewed before Synchronization starts.