asp.net core HTTP Error 503. The service is unavailable

c# iis asp.net-core kestrel
Philip picture Philip · Aug 29, 2018 · Viewed 8.4k times · Source

The event viewer shows the following errors

"The worker process failed to pre-load .Net Runtime version No Managed Code."

"The worker process failed to initialize correctly and therefore could not be started. The data is the error."

I am able to run dotnet website.dll from the command line and view it in the web browser but for some reason IIS does not run the asp.net core website.

I have installed the windows hosting dotnet core from here as well as the sdk

https://github.com/dotnet/core/blob/master/release-notes/download-archives/

I have set the .net clr version to No Managed Code

I changed the identity to administrator to eliminate potential permission issues

Enable-WindowsOptionalFeature -Online -FeatureName IIS-WebServerRole
Enable-WindowsOptionalFeature -Online -FeatureName IIS-WebServer
Enable-WindowsOptionalFeature -Online -FeatureName IIS-CommonHttpFeatures
Enable-WindowsOptionalFeature -Online -FeatureName IIS-HttpErrors
Enable-WindowsOptionalFeature -Online -FeatureName IIS-HttpRedirect
Enable-WindowsOptionalFeature -Online -FeatureName IIS-ApplicationDevelopment
Enable-WindowsOptionalFeature -Online -FeatureName NetFx4Extended-ASPNET45
Enable-WindowsOptionalFeature -Online -FeatureName IIS-HealthAndDiagnostics
Enable-WindowsOptionalFeature -Online -FeatureName IIS-HttpLogging
Enable-WindowsOptionalFeature -Online -FeatureName IIS-LoggingLibraries
Enable-WindowsOptionalFeature -Online -FeatureName IIS-RequestMonitor
Enable-WindowsOptionalFeature -Online -FeatureName IIS-HttpTracing
Enable-WindowsOptionalFeature -Online -FeatureName IIS-Security
Enable-WindowsOptionalFeature -Online -FeatureName IIS-RequestFiltering
Enable-WindowsOptionalFeature -Online -FeatureName IIS-Performance
Enable-WindowsOptionalFeature -Online -FeatureName IIS-WebServerManagementTools
Enable-WindowsOptionalFeature -Online -FeatureName IIS-IIS6ManagementCompatibility
Enable-WindowsOptionalFeature -Online -FeatureName IIS-Metabase
Enable-WindowsOptionalFeature -Online -FeatureName IIS-ManagementConsole
Enable-WindowsOptionalFeature -Online -FeatureName IIS-BasicAuthentication
Enable-WindowsOptionalFeature -Online -FeatureName IIS-WindowsAuthentication
Enable-WindowsOptionalFeature -Online -FeatureName IIS-StaticContent
Enable-WindowsOptionalFeature -Online -FeatureName IIS-DefaultDocument
Enable-WindowsOptionalFeature -Online -FeatureName IIS-WebSockets
Enable-WindowsOptionalFeature -Online -FeatureName IIS-ApplicationInit
Enable-WindowsOptionalFeature -Online -FeatureName IIS-NetFxExtensibility45
Enable-WindowsOptionalFeature -Online -FeatureName IIS-ASPNET45
Enable-WindowsOptionalFeature -Online -FeatureName IIS-ISAPIExtensions
Enable-WindowsOptionalFeature -Online -FeatureName IIS-ISAPIFilter
Enable-WindowsOptionalFeature -Online -FeatureName IIS-HttpCompressionStatic

Also, I had to change the .csproj to the following to get around conflicting asp.net core versions

  <PropertyGroup>
    <TargetFramework>netcoreapp2.0</TargetFramework> <PublishWithAspNetCoreTargetManifest>false</PublishWithAspNetCoreTargetManifest>
  </PropertyGroup>

Answer

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