Visual Studio 2017 Doesn't Run Core Apps with IIS Express

Question

I am having an issue with Visual Studio 2017 RC where when I run an MVC and/or WebAPI app using IIS Express the app never actually runs. Instead I get stuck with a page in the browser indicating it is trying to attach and from there it goes no further. If I open another tab/window in the browser and try to navigate directly to the launch URL, it just spins forever. Likewise when I run this using the dot net run command, the app launches and runs fine.

There do not seem to be any errors that I can see, just that the browser spins indefinitely without actually ever loading the page/endpoint.

Note: this occurs for most any circumstance. Newly created project in VS with no changes, known working project from previous versions, etc.

Answer 1

You could follow or upvote the issue: https://developercommunity.visualstudio.com/content/problem/11391/aspnet-core-iis-express-httplocalhost51733-failed.html

Looks like our workarounds meanwhile are

• dotnet run
• Publish to local IIS. Which is working for me.
• (Untested: downgrade from core-1.1 to core-1.0)

If you aren't familiar with VS2017/asp.net:

You have, or can reveal via View Menu-->Other Toolbars :

Debug toolbar --> dropdowncombobutton saying "[green arrow>] IIS Express"

• Click on the dropdown downarrow part of the button.

You should see a Run {yourprojectname} option. This is the equivalent of dotnet run {yourprojectname} from the commandline.

You can configure the options that appear in the dropdown with

Right-click on project in solution explorer --> Properties --> Debug