Starting with SonicOS 7.3.0, password complexity enforcement is enabled by default (requiring both alphanumeric and symbolic characters). If the secondary firewall is reset to the factory default settings (e.g., due to RMA), and the primary firewall still uses legacy password settings, synchronization across firewalls configured for High Availability may fail. Recommended Action: Option 1 (Recommended): Update the primary unit's password policy to match SonicOS 7.3 defaults. See KB Option 2: Adjust the secondary unit’s policy to match the primary's existing configuration. Keeping password policies aligned across High Availability firewalls is essential to avoid synchronization issues.