Azure ARM Template Error: Gateway size Default is not supported for gateways of type dedicatedcircuit.

    Trying to create a Virtual Network Gateway to connect a VNet to an already existing Express Route connection.

    I kept getting this error:

    Gateway size Default is not supported for gateways of type dedicatedcircuit

    Scratching my head and googling for the answer on this one for quite a while. I couldn’t find anything a property for “Gateway Size”. And I had specified Gateway Type in my ARM template.

    Until I found the following link on MSDN

    Gateway Types:

    • Basic SKU (deprecated)
    • Standard SKU
    • High Performance SKU
    • Ultra Performance SKU

    Wait, what did I specify in my ARM template for the Gateway Type? Ah yes, Basic.

    Changing the Gateway Type to “Standard” does the trick and fixes this error.