Using the .NET CLI to restore packages from a private NuGet feed error NU1301: Unable to load the service index for source

For the past years, I've been working in Visual Studio (the 2022 preview version is available), but recently I've given Visual Studio Code a shot. Transitioning between the two IDE's also means that you use the .NET CLI more extensively. Sadly, this was the cause of one annoying problem for me.

A couple of times a day, when I was trying to build a project, I bumped against the following error saying that I'm not authorized to access our private feed.

❯ dotnet build
Determining projects to restore...
[C:\Users\tdeschryver\dev\Project\Project\02.Services\ServiceOne\ServiceOne.Api.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.6.21355.2\NuGet.targets(131,5): error : Unable to load the service index for source https://pkgs.dev.azure.com/org/project/_packaging/feed/nuget/v3/index.json. [C:\Users\tdeschryver\dev\Project\Project.sln]
C:\Program Files\dotnet\sdk\6.0.100-preview.6.21355.2\NuGet.targets(131,5): error : Response status code does not indicate success: 401 (Unauthorized). [C:\Users\tdeschryver\dev\Project\Project.sln]

This led to frustrations and was counter-productive. As a work-around, I opened the project in Visual Studio to be authorized.

Some GitHub issues mentioned running the restore command with the interactive flag, but in my case, this ended up in the same error.

dotnet restore --interactive

After browsing through more GitHub issues, I found a comment that suggested installing the Microsoft NuGet CredentialProvider.

# On Windows
iex "& { $(irm https://aka.ms/install-artifacts-credprovider.ps1) }"
# On Linux
wget -qO- https://aka.ms/install-artifacts-credprovider.sh | bash

To my satisfaction, the error was finally gone.

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https://github.com/Microsoft/artifacts-credprovider#setup

Setup

If you are using dotnet or nuget, you can use the Azure Artifact Credential Provider by adding it to NuGet's plugin search path. This section contains both manual and scripted instructions for doing so.

Dotnet needs the netcore version to be installed. NuGet and MSBuild need the netfx version to be installed.

Installation on Windows

Automatic PowerShell script

PowerShell helper script

To install netcore, run installcredprovider.ps1
- e.g. iex "& { $(irm https://aka.ms/install-artifacts-credprovider.ps1) }"
To install both netfx and netcore, run installcredprovider.ps1 -AddNetfx. The netfx version is needed for nuget.exe.
- e.g. iex "& { $(irm https://aka.ms/install-artifacts-credprovider.ps1) } -AddNetfx"

Manual installation on Windows

Download the latest release of Microsoft.NuGet.CredentialProvider.zip
Unzip the file
Copy the netcore (and netfx for nuget.exe) directory from the extracted archive to $env:UserProfile\.nuget\plugins (%UserProfile%/.nuget/plugins/)

Using the above is recommended, but as per NuGet's plugin discovery rules, alternatively you can install the credential provider to a location you prefer, and then set the environment variable NUGET_PLUGIN_PATHS to the .exe of the credential provider found in plugins\netfx\CredentialProvider.Microsoft\CredentialProvider.Microsoft.exe. For example, $env:NUGET_PLUGIN_PATHS="my-alternative-location\CredentialProvider.Microsoft.exe". Note that if you are using both nuget and dotnet, this environment variable is not recommended due to this issue: NuGet/Home#8151

Azure DevOps Artifacts authentication issues · NuGet/Home Wiki · GitHub

命令行需要安装参考这个

Command line credential provider not installed

如果是visual studio使用中遇到这个问题的话，可能是账号的token过期了

Account session has expired

If you open Visual Studio's Account Settings window, any account with expired credentials will have a message saying that the credentials need to be refreshed.