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Connecting Azure App Service to VNet using Point to Site VPN using PowerShell

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It is possible to connect Azure App Services that are on Standard and Premium plans to a virtual network using a point to site VPN. Unfortunately although it is reasonably straightforward in the portal there isn’t much documentation around on how to do this using PowerShell. In response to a forum post, https://social.msdn.microsoft.com/Forums/en-US/2417fc64-e8d3-4b15-a493-7524f7d4961e/join-a-web-app-to-a-vpn-in-azure-through-powershell-script I created the connection with some help from https://resources.azure.com/.  The solution isn’t a work of art but hopefully enough to put people on the right track.

First you need an existing VNet with P2S configured. If you haven’t done that already I suggest reading my previous post – https://www.techdiction.com/2016/01/12/creating-a-point-to-site-vpn-connection-on-an-azure-resource-manager-virtual-network/
Then use the below PowerShell to connect the App Service to the VNet using P2S VPN:

 $subscription_id = "<Subscription_ID>"
$NetworkName = "<Network_Name>"
$location = "<Region>"
$netrgname = "<Resource_Group_VNet_is_in>"
$AppServiceName = ""<AppService_Name>"
 $props = @{
      "vnetResourceId" = "/subscriptions/$subscription_id/resourcegroups/$netrgname/providers/Microsoft.ClassicNetwork/virtualNetworks/$NetworkName";
      "certThumbprint"= "<Client_cert_thumbprint>";
      "certBlob"= "<Base64_Cert_Data>";
      "routes" = $null;
      }

New-AzureRMResource -ResourceName "$AppServiceName/$AppServiceName-to-$NetworkName" -Location $location  -ResourceGroupName MarcusWebsites -ResourceType Microsoft.Web/sites/virtualNetworkConnections -PropertyObject $props -ApiVersion "2015-08-01" -force