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NuGet Restore error - Response status code does not indicate success: 401 (Unauthorized)

When trying to build a project in Visual Studio, it failed while downloading the nuget packages from our internal Azure Artifacts nuget store.

In the logs I could find the following error message:

C:\Program Files\dotnet\sdk\3.0.100\NuGet.targets(123,5): error : Failed to retrieve information about 'Example.WebApi.Client' from remote source 'http://tfs:8080/tfs/DefaultCollection/_packaging/892779dc-d854-4c9f-8b26-833d52585ae6/nuget/v3/flat2/example.webapi.client/index.json'. [C:\Projects\MapSU\MapSU.Server.sln]

C:\Program Files\dotnet\sdk\3.0.100\NuGet.targets(123,5): error :   Response status code does not indicate success: 401 (Unauthorized). [C:\Projects\MapSU\MapSU.Server.sln]

Directly accessing the Azure Artifacts url worked without a problem, but when I tried to do this through Visual Studio or through the commandline it failed with the error above.

I was able to solve the problem by removing the ‘vscredentials’ in the Windows Credentials manager that referred to the tfs server:

  • Open the search bar in windows and search for Credentials Manager
  • Click on Manage Windows Credentials.
  • In the Credential Manager go to ‘Windows Credentials’
  • Scroll to the list of Generic Credentials. Click on the vscredentials one and click on Remove.

Now try to access Azure Artifacts again in Visual Studio. This time I got a login popup, after entering the correct credentials everything worked again.

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