Publish .NET Core 3.0 web app to Azure cloud

Question

I'm trying to publish an .NET Core 3.0 web app to the Azure cloud but apparently, version 3.0 is not supported yet. I've tried several things but nothing seems to be working. Can anyone help, please?

...

now I'm getting this error:

Error message picture

Update:

I see this is the log, btw.:

IIS was not able to access the web.config file for the Web site or application. This can occur if the NTFS permissions are set incorrectly.

IIS was not able to process configuration for the Web site or application.

The authenticated user does not have permission to use this DLL.

The request is mapped to a managed handler but the .NET Extensibility Feature is not installed.

Things you can try:

• Ensure that the NTFS permissions for the web.config file are correct and allow access to the Web server's machine account.
• Check the event logs to see if any additional information was logged.
• Verify the permissions for the DLL.
• Install the .NET Extensibility feature if the request is mapped to a managed handler.
• Create a tracing rule to track failed requests for this HTTP status code. For more information about creating a tracing rule for failed requests, click here.

Answer 1

You can just create a web app with .net core 2.x version. And then use Azure web app extension to install .net core 3.0 runtime environment:

The tutorial: https://microsoft.github.io/AzureTipsAndTricks/blog/tip21.html

---

Update:

From the kudu advanced tools, I see that the azure web app already has supported .net core 3.0.

And I can successfully deploy my .net core 3.0 web app to it:

---

Suggestions;

1. You can update your Visual Studio 2019 to last version, and try again. Try to deploy to a new web app in VS to see if it helps.

2. You can ignore the error, and deploy your website manually. (FTP, Zip deploy ).