AppGW v2 setup : check the subnet size (min /28)
Next to the Microsoft support request #119082022001909 (Impossible to create an AppGW v2 using Azure GUI Portal or AzureAppGWMigration.ps1 Application Gateway) : it appears it misses a check about the size of the subnet in which we want to deploy an Application Gateway v2.
We've tried several times to create an appGW v2 using a /29 subnet without success, but without warnings too, although it is a prerequisite as described here > https://docs.microsoft.com/en-us/azure/application-gateway/configuration-overview#size-of-the-subnet
We've tried it 'manually' using the Azure Portal GUI Wizard, or using a PS script (to migrate v1 to v2) and we've got the same error 'InternalServerError'.
We simply changed to a /28 subnet to solve it, as advised by the MS Engineer.
It could be usefull to check it before starting deployment of these resources.
Thank you in advance.