asp.net core - Why does Azure reset the Configuration for my App Service to .NET 6 (LTS) (deprecated)? - Stack Overflow

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Under Settings > Configuration for an Azure Web App Service, if the .NET Version is changed (followed by "Save") to either .NET 9 (STS), or to .NET 8 (LTS), and then Publish (having referenced the appropriate net9.0 or net8.0 target frameworks in the solution), the App Service fails to start up properly.

The following error page is displayed:

HTTP Error 500.30 - ASP.NET Core app failed to start

Meanwhile, Azure reverts the configuration for the App Service back to .NET 6 (LTS) (deprecated).

Under Settings > Configuration for an Azure Web App Service, if the .NET Version is changed (followed by "Save") to either .NET 9 (STS), or to .NET 8 (LTS), and then Publish (having referenced the appropriate net9.0 or net8.0 target frameworks in the solution), the App Service fails to start up properly.

The following error page is displayed:

HTTP Error 500.30 - ASP.NET Core app failed to start

Meanwhile, Azure reverts the configuration for the App Service back to .NET 6 (LTS) (deprecated).

• azure
• asp-core
• azure-web-app-service

Share Improve this question Follow edited Mar 24 at 6:59 marc_s 756k184184 gold badges1.4k1.4k silver badges1.5k1.5k bronze badges asked Mar 24 at 6:51 CNHumeCNHume 9322 silver badges1212 bronze badges 6

• Are you trying to upgrade your app to .NET Core 8 or 9 from .NET Core 6? – Aslesha Kantamsetti Commented Mar 24 at 6:57
• Please Share the Logs from the Log Stream. – Aslesha Kantamsetti Commented Mar 24 at 6:58
• I upgraded my projects to net8.0 on December 12th, 2023 which worked even when using framework-dependent deployment. I upgraded to net9.0 when it was released on November 14th 2024. In the latter case, I have been forced to use the self-contained rather than framework-dependent deployment. Until very recently, this was publishing and starting up properly. – CNHume Commented Mar 24 at 15:46
• Is your issue resolved? – Aslesha Kantamsetti Commented Mar 25 at 4:38
• No, the issue is not resolved. Furthermore, the Application Event Viewer Tool Failed. – CNHume Commented Mar 25 at 10:09

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1 Answer 1

Sorted by: Reset to default 0

HTTP Error 500.30 - ASP. NET Core app failed to start

The above error usually occurs due to issues with application code or dependencies, missing .NET Runtime version.

For you It may be due to dependencies because you're changing core versions from core 6 to core 8 to core9.

When a configured runtime fails to start, it tries to revert to .NET 6 (LTS, deprecated) rather than .NET 8, which could be due to cached settings or older infrastructure.

When you upgrade app to higher versions make sure to delete obj and bin folders and update the NuGet Packages.

Example .csproj file:

<Project Sdk="Microsoft.NET.Sdk.Web">
  <PropertyGroup>
    <TargetFramework>net9.0</TargetFramework>
    <Nullable>enable</Nullable>
    <ImplicitUsings>enable</ImplicitUsings>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="9.0.3" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="9.0.3" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="9.0.3" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="9.0.3">
      <PrivateAssets>all</PrivateAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </PackageReference>
    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="9.0.0" />
  </ItemGroup>
</Project>

Clear the NuGet Storage by selecting Tools -> NuGet Package Manager -> Package Manager Settings -> NuGet Package Manager -> General -> Clear All NuGet Storage -> OK.

Before deploying your app to Azure, delete the wwwroot folder using the Kudu Console. This may help clear the previous deployment.

If still facing the issue check Azure logs for detailed errors using below command Or Create new Azure Web app.

az webapp log tail --name <AppServiceName> --resource-group <ResourceGroupName>

Azure Output:

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