Update to our previous communication: We previously
announced the retirement of all Inbound NAT rules version 1 resources, which
included both single-VM NAT rules and NAT pools for Virtual Machine Scale
Sets. We have narrowed the scope of this retirement to Inbound NAT pools
only.
NAT pools are being retired because they provide the
same functionality as Inbound NAT rules v2, which offer improved performance
and is the recommended option for Virtual Machine Scale Sets (VMSS).
Understanding the difference:
Inbound NAT rules version 1 includes two resource types:
- Inbound
NAT rules version 1: Port forwarding to a single virtual machine.
This feature is not affected.
- Inbound
NAT pools: Port forwarding to Virtual Machine Scale Set
instances. This feature is retiring.
On September 30, 2027, Inbound NAT pools in Azure Load
Balancer will be retired. Starting November 15, 2026, you will no longer be
able to create new Inbound NAT pools. Existing configuration will continue to
function until September 30, 2027.
Recommended action:
To avoid potential service disruptions, we recommend that
you migrate
to Inbound NAT rules version 2 in Azure Load Balancer by September 30,
2027.