SonicWALL Stateful High Availability Upgrade for TZ300/SOHO Series

Ensure uninterrupted network security with the SonicWALL Stateful High Availability Upgrade, a software license that enables automatic active/passive failover between two identical SonicWALL TZ300 or SOHO appliances. This feature maintains connection states during failover, guaranteeing seamless continuity for your business operations.

Overview

Designed for small to medium businesses, this upgrade adds stateful high availability to your existing SonicWALL firewall deployment. By synchronizing connection states between paired appliances, it ensures that if the primary unit fails, the secondary takes over instantly without dropping sessions, preserving VPN tunnels, VoIP calls, and other critical traffic.

What stands out

• Stateful failover: Maintains active connections during switchover, preventing service interruptions.
• Automatic active/passive configuration: No manual intervention required when a failure occurs.
• Perpetual license: One-time activation for continuous high availability.
• Easy deployment: Activated via software key on supported SonicWALL appliances.
• Business continuity: Minimizes downtime and ensures continuous security enforcement.

Technical details

• Product type: Software license / feature upgrade
• License feature: Stateful High Availability (HA)
• Supported firewall series: SonicWALL TZ300 Series, SonicWALL SOHO Series
• Failover mechanism: Automatic active/passive
• Stateful synchronization: Yes
• Required hardware: Two identical SonicWALL appliances (e.g., TZ300)
• Installation method: Software activation key
• License duration: Perpetual
• Part number: 01-SSC-0521
• Target environment: SOHO, SMB
• Management: SonicWALL GMS or local UI
• Network impact: Seamless failover without service interruption

Our verdict

A cost-effective way to add enterprise-grade redundancy to your SonicWALL firewall, ensuring your network stays protected even during hardware failures.