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Enable ASP.NET 4.5 On Windows 10 or Windows 8/8.1

September 22, 2015 - .NET / C#, ASP.NET MVC, Geek Bits, Visual Studio 2012, Web APIs, Web Stuff
Enable ASP.NET 4.5 On Windows 10 or Windows 8/8.1

By default IIS and ASP.NET aren’t configured as part of a Windows setup (for obvious reasons) so developers are used to having to register IIS manually before being able to run and develop ASP.NET web sites on their desktops.  Prior to Windows 8 it was a simple command like this:

aspnet_regiis -r

This no longer works and requires a different command. Depending on what you already have enabled this may work:

dism /online /enable-feature /featurename:IIS-ASPNET45

If you haven’t enabled anything related to IIS yet you can do that at the same time with:

dism /online /enable-feature /all /featurename:IIS-ASPNET45

However!  That might not appear to solve the problem even when it has!  A post from Microsoft makes a bug apparent:

After the installation of the Microsoft .NET Framework 4.6, users may experience the following dialog box displayed in Microsoft Visual Studio when either creating new Web Site or Windows Azure project or when opening existing projects.

Configuring Web http://localhost:64886/ for ASP.NET 4.5 failed. You must manually configure this site for ASP.NET 4.5 in order for the site to run correctly. ASP.NET 4.0 has not been registered on the Web server. You need to manually configure your Web server for ASP.NET 4.0 in order for your site to run correctly.

NOTE: Microsoft .NET Framework 4.6 may also be referred to as Microsoft .NET Framework 4.5.3

This issue may impact the following Microsoft Visual Studio versions: Visual Studio 2013, Visual Studio 2012, Visual Studio 2010 SP1

Workaround:

Select “OK” when the dialog is presented. This dialog box is benign and there will be no impact to the project once the dialog box is cleared. This dialog will continue to be displayed when Web Site Project or Windows Azure Projects are created or opened until the fix has been installed on the machine.

Resolution:

Microsoft has published a fix for all impacted versions of Microsoft Visual Studio.

Visual Studio 2013 –

Visual Studio 2012

Visual Studio 2010 SP1

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3 thoughts on “Enable ASP.NET 4.5 On Windows 10 or Windows 8/8.1

avatar
Germán

I had to put dism /online /enable-feature /all /featurename:IIS-ASPNET45
(added /all) but it worked then! thank you much.

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avatar
Robson Garcia

Great!

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avatar
Daniel

Yep! it worked for me as well. Also had to use the /all option.
Thanks a lot 🙂

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