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Azure App Service: .NET 9 (STS) end of support

End of support date for .NET 9 (STS) on Azure App Service: 10 Nov 2026. Apps keep running after that date but stop receiving security updates and customer service for .NET 9.

Support ended , 10 Nov 2026

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What breaks

Apps hosted on App Service that use .NET 9 (STS) continue to run after the end of support date. Security updates are no longer available for .NET 9 (STS). Microsoft no longer provides customer service for .NET 9 (STS).

Who is affected

Affected versions

  • 9

Matching resource types

  • microsoft.web/sites
  • azurerm_linux_web_app
  • azurerm_windows_web_app

Fields the check reads

  • linuxfxversion
  • kind
  • site_config.application_stack.dotnet_version
  • site_config.application_stack.current_stack

Detected by the estate check from

  • Azure Resource Graph export (CSV or JSON)
  • Terraform state or plan (JSON)
  • ARM template

Check your estate for this

What to do

Upgrade the app to .NET 10 (LTS) before the end of support date by following the steps Microsoft links: follow the steps to upgrade your app to .NET 10 (LTS). The support policy is described in App Service language support.

Replacement

.NET 10 (LTS)

Sources

Last checked against the first source in this list on .

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