- Products
- Network Security
Next Generation FirewallNext-generation firewall for SMB, Enterprise, and Government
Security ServicesComprehensive security for your network security solution
Network Security ManagerModern Security Management for today’s security landscape
- Advanced Threat Protection
Capture ATPMulti-engine advanced threat detection
Capture Security applianceAdvanced Threat Protection for modern threat landscape
- Access Security
Cloud Edge Secure AccessDeploy Zero-Trust Security in minutes
Secure Mobile AccessRemote, best-in-class, secure access
Wireless Access PointsEasy to manage, fast and secure Wi-FI
SwitchesHigh-speed network switching for business connectivity
- Email Security
Email SecurityProtect against today’s advanced email threats
- Cloud Security
Cloud App SecurityVisibility and security for Cloud Apps
Cloud Firewall (NSv)Next-generation firewall capabilities in the cloud
- Endpoint Security
Capture ClientStop advanced threats and rollback the damage caused by malware
Content Filtering ClientControl access to unwanted and unsecure web content
- Product Widgets
- Product Menu Right Image
- Network Security
- Solutions
- Solutions Widgets
- Solutions Image Widgets
- Solutions Widgets
- Partners
- Partner Widgets
- Partners Image Widgets
- Partner Widgets
- Support
- Support Widget
- Support Image Widgets
- Support Widget
- Products
- Network Security
- Next Generation FirewallNext-generation firewall for SMB, Enterprise, and Government
- Security ServicesComprehensive security for your network security solution
- Network Security ManagerModern Security Management for today’s security landscape
- Advanced Threat Protection
- Capture ATPMulti-engine advanced threat detection
- Capture Security applianceAdvanced Threat Protection for modern threat landscape
- Access Security
- Cloud Edge Secure AccessDeploy Zero-Trust Security in minutes
- Secure Mobile AccessRemote, best-in-class, secure access
- Wireless Access PointsEasy to manage, fast and secure Wi-FI
- SwitchesHigh-speed network switching for business connectivity
- Email Security
- Email SecurityProtect against today’s advanced email threats
- Cloud Security
- Cloud App SecurityVisibility and security for Cloud Apps
- Cloud Firewall (NSv)Next-generation firewall capabilities in the cloud
- Endpoint Security
- Capture ClientStop advanced threats and rollback the damage caused by malware
- Content Filtering ClientControl access to unwanted and unsecure web content
- Product Widgets
- Product Menu Right Image
- Network Security
- Solutions
- Solutions Widgets
- Solutions Image Widgets
- Solutions Widgets
- Partners
- Partner Widgets
- Partners Image Widgets
- Partner Widgets
- Support
- Support Widget
- Support Image Widgets
- Support Widget
Troubleshooting an Unexpected Failover in HA- High Availability
03/26/2020 
86 People found this article helpful
40,533 Views
Description
This article will define the steps you can take to prevent or resolve an issue with unexpected failover either on your own or with the help of SonicWall support
Resolution
The first step is to gather data from both units. Since a failover can happen for more than one reason the logs from both units are required to help determine the root cause. If you are planning on the help of support to determine the cause all of the following files must be uploaded to your service request. Follow this link on how to gather the required files:
How to gather required files for SonicWall Support
Pro tip - Create your case online before calling into support, you will be routed directly to your support queue bypassing customer service and significantly reduce your time on the phone:
How to submit a support case online at MySonicWall.com
1. Download the 'All' tracelog file
2. Search for the HA event using MM/DD format
3. Once you find the event you can use these clues to determine next steps. Here in the primary's tracelogs we see the standby unit was active, the primary unit stopped recieving heartbeats from secondary. The secondary unit triggered an outage so the primary became active. Now we need to check the secondary logs, tracelogs, the configuration including physical configuration for any other issues on this date that may have contributed to this event:
Some common reasons for an unexpected failover are:
- HA Misconfiguration- It's important to have HA set up correctly to ensure stability. Follow the tips in this KB for HA best practices and be sure you have your X0 monitoring IPs configured. The X0 functions as a backup HA link when there is a connection between the primary and standby X0 interface.
Tips for High Availability Best Practices
2. Unsupported SFP modules:
SFP and SFP+ modules that can be used with SonicWall firewalls
3. System Crash- Check the uptime of both active and standby units in System Status to determine if either one has gone down recently:
Troubleshooting a System Crash
Related Articles
- Supported Public Cloud Servers/Instance Sizes on SonicWall NSv Series Models
- Why do I need a Support Services Reinstatement?
- How can I configure a VPN between a SonicWall firewall and Microsoft Azure?
Categories
- Firewalls > SonicWall SuperMassive 9000 Series > High Availability
- Firewalls > SonicWall NSA Series > High Availability
- Firewalls > TZ Series > High Availability
YES
NO