WAN Connection Auto Rollback in uOS 1.31

Zyxel_Claudia

The WAN Connection Auto Rollback feature in uOS 1.31 ensures that a firewall does not lose its Internet connection due to misconfigured WAN settings.

1. What is WAN Connection Auto Rollback?

Purpose: Prevents network downtime by automatically reverting to the previous working WAN configuration if a new setting disconnects the firewall from Nebula (NCC) for more than 1 minute.

Scenario: If an admin accidentally misconfigures WAN settings in NCC, the firewall will revert to the last working configuration and stay connected.

However, if you are switching to a new ISP, rollback can block the new settings from taking effect, as the firewall will keep reverting to the old ISP settings.

2. How Rollback is Triggered

Rollback will occur automatically if:The firewall is connected to Nebula then a new WAN configuration is applied.The new settings cause a loss of connectivity for more than 1 minute.

Once triggered, the firewall will restore the last working WAN configuration and attempt to reconnect to Nebula.

3. How to Disable Auto Rollback

To successfully change ISPs, you must disable auto rollback before updating WAN settings.

Steps to Disable Auto Rollback:

• Go to: Network → WAN Settings
• Enable "Change to a Different ISP"
• Apply the new WAN settings

Key Point:

• "Change to a Different ISP" (Enabled) = Auto Rollback OFF
• "Change to a Different ISP" (Disabled) = Auto Rollback ON (Default behavior)

If you don’t enable this setting, the firewall will keep rolling back to the old ISP settings!

4. Where to Monitor Rollback Events?

If a rollback occurs, you can check the event logs.

Log Locations:

• Local GUI: Log & Report → Log Events
• NCC: Site-wide → Monitor → Firewall → Event log

Log Message:"Config rolled back due to disconnection".