I'm having a really tough time with a private Azure Function that just won't work as expected. I've set it up multiple times, and while I can run a simple test successfully, it breaks afterwards with a vague "InternalServerError" message when my developers try to access it. Here's a bit about my setup: I'm using VNET integration for outbound access, I've created inbound private endpoints, and there's an Azure firewall with a route table for the integrated subnet. Right now, my outbound firewall is wide open as part of my troubleshooting efforts, and I've also set up a private storage account with endpoints. I've updated the Network Security Groups (NSGs) to allow appropriate access and configured DNS accordingly. It works perfectly the first time, but then just gives that internal error on subsequent tries, no matter how many times I restart or rebuild it. Has anyone else faced this issue? I'm looking for insights—especially from those who have managed to set up a fully private function app with a private storage account.
3 Answers
This can be really frustrating! Most of the time, it tends to be related to storage networking issues, like missing registrations for private endpoints or VNET links. If you’re on a P0 plan, you might want to consider skipping the storage account file share altogether, as the premium plans have built-in storage. It could streamline your processes and reduce headaches!
It could be a deployment issue you’re running into. I've seen cases where a typo in the SQL connection string or key vault variable can throw those errors. Digging into the logs is key to uncovering the exact internal error.
Have you checked your diagnostic settings to get more insight into what's going wrong? Sometimes, if you deploy a more complex function, it can lead to issues while a simple one runs just fine. By the way, make sure that the managed identity for your function has the necessary permissions on the storage account for the data plane.
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