primary VMs have no external network access

[ausfestivus]

Evening,

Ran a few deploys today from this module and my fork and none of the primary VMs have any inbound or outbound network connectivity.

Other knowns:

• SSH access is not available from an Azure Bastion instance.
• If I build a new plain VM in the RG (Ubuntu 18.x for example) I AM able to SSH to it. I am then able to SSH to the 3x primary VMs from the plain VM.
• This worked fine on Friday 13th December.
• The 3x primary VMs have no internet access
• Deletion of the NSG doesnt cause a change in behaviour
• Deletion of the LB doesnt cause a change in behaviour

Ive been trying to isolate what could be causing it and I am at a loss.
Ive opened a case with Azure Support just now. Their upfront diag wizards said everything should be working as normal.

Very odd this one. Wonder if its an MS change or an AzureRM change.

[ausfestivus]

Ive tracked down the root cause of this behaviour. See hashicorp/terraform-provider-azurerm#4983

I will leave this issue open for the next poor sap that gets bitten by it.