Cannot install dotnet-ef tool on Windows 10

.net-core asp.net asp.net-core c# entity-framework-core

Question

I'm trying to install the dotnet-ef tool via the dotnet-cli.

The command that I enter: dotnet tool install --global dotnet-ef

I gives me the following error:

The tool package could not be restored.
Tool 'dotnet-ef' failed to install. This failure may have been caused by:

* You are attempting to install a preview release and did not use the --version option to specify the version.
* A package by this name was found, but it was not a .NET Core tool.
* The required NuGet feed cannot be accessed, perhaps because of an Internet connection problem.
* You mistyped the name of the tool.

I'm using dotnet 3.0, I believe I didn't have this problem on MacOS, I'm now trying to execute the same command on my Windows 10 machine and it gives me that error.

Some info using dotnet --info command:

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

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.18362
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\3.0.100\

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

.NET Core SDKs installed:
  3.0.100 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:
  Microsoft.AspNetCore.All 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET Core runtimes or SDKs:
  https://aka.ms/dotnet-download 
1
5
11/8/2019 10:01:10 AM

Accepted Answer

I got it working by adding the --version flag and specifying the version to 3.0.0.

The command that I used:

dotnet tool install --global dotnet-ef --version 3.0.0

14
11/8/2019 10:16:41 AM

Popular Answer

I got this error message, but when I closely inspected all the errors I also had:

Response status code does not indicate success: 407 (Proxy Authorization Required).

Turning off the proxy while running the command fixed the issue.



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