Running asp.net 5 website in IIS 10 throws Couldn't determine an appropriate version of runtime to run error

Question

I've just created a new ASP.NET 5 web application in Visual Studio 2015. It runs fine under IIS Express, but when I create a site in IIS 10 on Windows 10 and point it at the wwwroot folder I get a YSOD:

Couldn't determine an appropriate version of runtime to run

This has been discussed elsewhere but in my case the project.json file looks ok:

"frameworks": {
  "dnx451": { },
  "dnxcore50": { }
},

As with the other post, here's the output of dmvm list:

Active Version     Runtime Architecture Location                     Alias
------ -------     ------- ------------ --------                     -----
       1.0.0-beta5 clr     x64          C:\Users\Simon\.dnx\runtimes
       1.0.0-beta5 clr     x86          C:\Users\Simon\.dnx\runtimes
       1.0.0-beta5 coreclr x64          C:\Users\Simon\.dnx\runtimes
       1.0.0-beta5 coreclr x86          C:\Users\Simon\.dnx\runtimes

All of the dependencies are beta5 in project.json

Has anyone else got this to work with IIS on Windows 10?

I haven't been able to try windows 10 yet, but did you try the console approach and run dnu publish? I know I had worlds of trouble with tiny adjustments that were overlooked or low-documented, and forcing the runtime with the --runtime option helped. EDIT <-- sorry, I meant to say I had adjustment woes in VS 2015 and the file system publish option — Nathan Teague

Nathan Teague Nathan Teague · Accepted Answer · 2015-09-02T01:40:37

I just noticed after doing some research (I have battled a lot of the ASP .Net5 hurdles at my own job -- I had a difficulty with this error between beta 5 and 6... was fighting architecture differences. One thing that got me on track was I ran the

dnvm use {version u need} and did dnu restore on command line. I noticed you have no default on the dnvm list output, so it may be trying to publish multiple runtimes to your project output directory. I'd investigate ./approot/runtimes/... and see how many different runtimes there are; there should only be one.

Running asp.net 5 website in IIS 10 throws Couldn't determine an appropriate version of runtime to run error

1 Answers