Azure Site2Site VPN (ARM to Classic)

Issue:

Unable to get the new connection from classic to ARM VPN Gateway connected

Cause:

Authentication failure

Resolution:

Use the below commands to get the existing pre-shared key on the classic VPN gateway and then try to update the same on either sides.

Get-AzureVNetGatewayKey

   -VNetName <String>

   -LocalNetworkSiteName <String>

   [-Profile <AzureSMProfile>]

   [<CommonParameters>]

More Information:

PowerShell installation to use classic commands:

Install-Module -Name PowerShellGet -Force

Install-Module Azure

Install-Module Azure -AllowClobber

Import-Module Azure

Note:

While trying to use the classic subscription via PowerShell, you might have not seen the subscription listed from the below commands:

Add-AzureAccount

Get-AzureSubscription

To see your classic subscription here, you would have to add yourself as a co-administrator for the Classic Account which is what you did in this case.

Documentations for future references:

https://www.powershellgallery.com/packages/PowerShellGet/2.2.1

https://docs.microsoft.com/en-us/powershell/azure/servicemanagement/install-azure-ps?view=azuresmps-4.0.0#how-to-get-powershellget

https://docs.microsoft.com/en-us/azure/virtual-network/virtual-network-create-udr-classic-ps