Problem and solution when the forward and reverse paths of sessions are inconsistent on the USG2000 and USG5000

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Configure sticky load balancing on the device.

Other related questions:
Why does TCP services are interrupted when quick session backup is enabled in case of inconsistent forward and return paths
In case of inconsistent forward and return paths, the synchronization may fail or be delayed due to traffic bursts, result in service delay or interruption. For example, one firewall forwards TCP SYN packets, and the other forwards TCP ACK packets. If the session table is not synchronized, ACK packets may be discarded. If this condition poses great impacts on services, disable stateful inspection on the firewall.

Configuring reverse masks for ACLs on the USG2000 and USG5000 series
Write out a mask with 0 and 1 and perform a reverse operation.

Permitting all forwarding policies on the USG2000 and USG5000
You can set the action to permit or deny when you configure a forwarding policy.

Problem and solution when the USG2000 and USG5000 series can properly work only after the undo shutdown command is executed on the interface
The interface has been manually disabled.

Problem and solution when a KVM fails
Possible cause: The problem occurs when the power supply is unstable and has transient breaks after the reconstruction of the UPS. Solution: 1. Reinsert the USB cable. 2. If the problem persists, restart the KVM. 3. Replace the faulty keyboard and mouse or the KVM. 4. If the problem persists, restart the SVP.

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