Sonicwall nsa 2400 enable firmware auto update. If your SonicWall security appliance is not registered, the following message is displayed in the Security Services folder on the System > Status page in the SonicOS management interface: Your SonicWall is not registered. Click here to Register your SonicWALL. NSA 2600 Firewall pdf manual download. Before You Register. View and Download SonicWALL NSA 2600 getting started manual online.