Azure Gateway Load Balancer Return Traffic Decapsulation Error

Azure Gateway Load Balancer Return Traffic Decapsulation Error

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Created On 01/10/23 21:09 PM - Last Modified 06/08/23 18:22 PM


Symptom


Traffic on the firewall is being sent but not returned. Traffic is making it to the destination but it is failing to return and decapsulate.

Environment


Azure Firewall with a Gateway Load balancer with a v5 SKU type for the VM Size.

Cause


The interfaces on a VM Size V5 SKU type are not supported. In Azure documentation it shows that only V4 support and not V5.

Resolution


Need to change the machine size to a SKU type of V4. This will resolve the issue.
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