Unable to start IIS Express after updating Windows 24H2

Irfan Bawa Suteja 20 Reputation points
2025-01-08T23:10:01.8166667+00:00

Hi,

After updating to Windows 24H2, starting a web application in Visual Studio with .NET Framework 4.8 shows the error:

Unable to start program Files\llS Express\iisexpress.exe.

The process has been terminated.

Refresh the process list before attempting another attach.

How can I resolve this issue?

OS: Windows 24H2 .NET Framework Version: 4.8

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Visual Studio Debugging
Visual Studio: A family of Microsoft suites of integrated development tools for building applications for Windows, the web and mobile devices.Debugging: The act or process of detecting, locating, and correcting logical or syntactical errors in a program or malfunctions in hardware. In hardware contexts, the term troubleshoot is the term more frequently used, especially if the problem is major.
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Accepted answer
  1. Lex Li (Microsoft) 5,747 Reputation points Microsoft Employee
    2025-01-13T05:30:48.1933333+00:00

    Expand the comment to an answer.

    It has been reported elsewhere that after certain Windows updates, some Windows HTTP API settings are lost or broken.

    Since IIS Express leaves quite a few of its key settings there for HTTPS, issues might appear like the one described above.

    You might go to Control Panel | Programs and repair IIS Express installation. The installer will try to apply the mandatory settings once again and IIS Express should start to work again.

    1 person found this answer helpful.
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