Advisor recommendation for default outbound connectivity is incorrect for some VMs

Hello Rich,

Kindly check the below steps and see if it works

1. Verify NAT Gateway Configuration: Double-check that the NAT gateway is correctly associated with the subnet where the VMs are located. Make sure there are no issues with the configuration that could prevent it from functioning properly.
2. Check for Default Outbound Access: Identify if the defaultOutboundConnectivityEnabled parameter is set to false on those VMs that should not require explicit outbound access. This can be done through Azure PowerShell or Azure CLI.
3. Deallocate and Restart the VMs: Sometimes, changes to network configurations, including NAT gateways, require that you stop and deallocate the VM for them to take effect. Once done, start the VM again and check the Advisor recommendations.
4. Review Network Security Groups and Routes: Make sure there are no Network Security Group (NSG) rules or User Defined Routes (UDR) that might conflict with the expected outbound connectivity.

Referred document:

Troubleshoot Azure NAT Gateway connectivity - Azure NAT Gateway | Microsoft Learn

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