Visual Studio 2015 can't start IIS Express

Question

When I am trying to run an ASP.Net Core project in Visual Studio 2015, a Microsoft Visual Studio dialog appears \"The project doesn\'t know how to run the profile IIS Expres

Answer 1

I had this same issue and after digging around for a while I discovered that I had dotnet preview v1.0.0-preview2 installed under Programs Files (x86) and a non-preview version in x64. I think VS is launching the x86 (preview) version but expecting to see the full version. To fix this, I did the following.

• from programs and feature uninstall every visible dotnet core. (note: this did not remove the x86 preview)
• go to https://www.microsoft.com/net/download/core#/sdk and install BOTH x86 and x64 SDK packages
• open command line and from the root directory check run: dotnet --version (at the time of writting it was 1.0.4
• fire up .net core project in VS 2017 and run.

When I did all of the above, I was able to start up the site in IIS Express from VS.