CODEWITHSUNDEEP
c#.netasp.net-core.net-core
Kurtis Jungersen
Kurtis Jungersen

Reputation: 2554

Can't Load a .Net Core 3.0 Web App Running From CLI

Issue:

I have a .Net Core 3.0 app that I'm unable to load in a browser ONLY when running it using the Mac OS X CLI, like so:

$ dotnet new webapp
$ dotnet watch run
watch : Started
info: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[0]
      User profile is available. Using '/Users/<user>/.aspnet/DataProtection-Keys' as key repository; keys will not be encrypted at rest.
info: Microsoft.Hosting.Lifetime[0]
      Now listening on: https://localhost:5001
info: Microsoft.Hosting.Lifetime[0]
      Now listening on: http://localhost:5000
info: Microsoft.Hosting.Lifetime[0]
      Application started. Press Ctrl+C to shut down.
info: Microsoft.Hosting.Lifetime[0]
      Hosting environment: Development
info: Microsoft.Hosting.Lifetime[0]
      Content root path: /Users/<user>/Sandbox/coreapp3test

So everything looks good at this point, except when opening the URL in a browser I receive:

This site cannot be reached

localhost unexpectedly closed the connection.

UPDATE:

I think it has something to do with HTTPS protocol. Navigating to http://localhost:5000 does render an https redirect. So the server is actually listening...

info: Microsoft.AspNetCore.Hosting.Diagnostics[1]
      Request starting HTTP/1.1 GET http://localhost:5000/
info: Microsoft.AspNetCore.Hosting.Diagnostics[2]
      Request finished in 9.6705ms 307

UPDATE 2:

Furthermore, removing the app.UseHttpsRedirection(); from the Configure method of startup.cs and then navigating to http://localhost:5000 renders the page correctly, while https://localhost:5001 still fails.

I've opened a ticket on GitHub to track the issue.

Notes:

System Info:

$ dotnet --info

.NET Core SDK (reflecting any global.json):
 Version:   3.0.100
 Commit:    04339c3a26

Runtime Environment:
 OS Name:     Mac OS X
 OS Version:  10.14
 OS Platform: Darwin
 RID:         osx.10.14-x64
 Base Path:   /usr/local/share/dotnet/sdk/3.0.100/

Host (useful for support):
  Version: 3.0.0
  Commit:  7d57652f33

.NET Core SDKs installed:
  2.1.300 [/usr/local/share/dotnet/sdk]
  2.1.402 [/usr/local/share/dotnet/sdk]
  2.1.505 [/usr/local/share/dotnet/sdk]
  3.0.100 [/usr/local/share/dotnet/sdk]

.NET Core runtimes installed:
  Microsoft.AspNetCore.All 2.1.0 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.4 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.9 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.0 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.4 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.9 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.0.0 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.0 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.4 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.9 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.0.0 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET Core runtimes or SDKs:
  https://aka.ms/dotnet-download

Upvotes: 2

Views: 4489

Answers (2)

Kurtis Jungersen
Kurtis Jungersen

Reputation: 2554

v3.1 Update

This has been resolved in v3.1.x, per the dotnet team on Github.

Upvotes: 1

McKabue
McKabue

Reputation: 2222

running from vs code does dotnet run. It appears that the watch command has an infinite loop trying to watch some files that are contantly changing. This may be due to for example reloadOnChange option in configurationBuilder.

configurationBuilder.AddJsonFile(
            "appsettings.json",
            optional: false,
            reloadOnChange: true)

Upvotes: 1

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