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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
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(128, 8%, 22%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
Hi @Irfan Bawa Suteja,
Does this problem only occur in specific projects, or does it occur in all projects? You can try to create a new one and check if it has same issue.
In addition, can you start iisexpress manually using for example command line like this:
iisexpress /site:SiteName ? Just refer to this doc for more details: Running IIS Express from the Command Line.
Please go to Control Panel | Programs and repair IIS Express installation. That might help.
Hi @Anonymous ,
I've two startup projects. WCF and ASP.NET MVC.
Only the ASP.NET MVC face the problem.
But, after repairing the IIS as @Lex Li (Microsoft) suggested, the issues seem to be fixed.
Both projects are running ok now. Thank you everyone for the support.
I appreciate that.
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.