Unhandled exception: System.Net.Http.HttpRequestException: Response status code does not indicate success: 401 (Unauthorized).

Question

I added an additional nuget package source to my project. I have entered my username and my password and I can install new nuget packages from the source. But I always get this error when I use the command dotnet tool restore in the Visual Studio Terminal. I use Visual Studio Community 2022 (64-bit) Version 17.9.7.

Why is my project not working when I use an additional nuget package source in my project? How can I fix this error?

Unhandled exception: System.Net.Http.HttpRequestException: Response status code does not indicate success: 401 (Unauthorized). at System.Net.Http.HttpResponseMessage.EnsureSuccessStatusCode() at NuGet.Protocol.HttpSource.<>c__DisplayClass15_01.<<GetAsync>b__0>d.MoveNext() --- End of stack trace from previous location --- at NuGet.Common.ConcurrencyUtilities.ExecuteWithFileLockedAsync[T](String filePath, Func2 action, CancellationToken token) at NuGet.Common.ConcurrencyUtilities.ExecuteWithFileLockedAsyncT at NuGet.Protocol.HttpSource.GetAsync[T](HttpSourceCachedRequest request, Func2 processAsync, ILogger log, CancellationToken token) at NuGet.Protocol.PackageMetadataResourceV3.LoadRegistrationIndexAsync(HttpSource httpSource, Uri registrationUri, String packageId, SourceCacheContext cacheContext, Func2 processAsync, ILogger log, CancellationToken token) at NuGet.Protocol.PackageMetadataResourceV3.GetMetadataAsync(String packageId, Boolean includePrerelease, Boolean includeUnlisted, VersionRange range, SourceCacheContext sourceCacheContext, ILogger log, CancellationToken token) at NuGet.Protocol.PackageMetadataResourceV3.GetMetadataAsync(String packageId, Boolean includePrerelease, Boolean includeUnlisted, SourceCacheContext sourceCacheContext, ILogger log, CancellationToken token) at Microsoft.DotNet.Cli.NuGetPackageDownloader.NuGetPackageDownloader.GetPackageMetadataAsync(PackageSource source, String packageIdentifier, Boolean includePrerelease, Boolean includeUnlisted, CancellationToken cancellationToken) at Microsoft.DotNet.Cli.NuGetPackageDownloader.NuGetPackageDownloader.GetPackageMetadataAsync(String packageIdentifier, NuGetVersion packageVersion, IEnumerable1 sources, CancellationToken cancellationToken, Boolean includeUnlisted) at Microsoft.DotNet.Cli.NuGetPackageDownloader.NuGetPackageDownloader.GetPackageSourceAndVersion(PackageId packageId, NuGetVersion packageVersion, PackageSourceLocation packageSourceLocation, Boolean includePreview, Boolean includeUnlisted, PackageSourceMapping packageSourceMapping) at Microsoft.DotNet.Cli.NuGetPackageDownloader.NuGetPackageDownloader.DownloadPackageAsync(PackageId packageId, NuGetVersion packageVersion, PackageSourceLocation packageSourceLocation, Boolean includePreview, Boolean includeUnlisted, Nullable1 downloadFolder, PackageSourceMapping packageSourceMapping) at Microsoft.DotNet.Cli.ToolPackage.ToolPackageDownloader.DownloadAndExtractPackage(PackageLocation packageLocation, PackageId packageId, INuGetPackageDownloader nugetPackageDownloader, String packagesRootPath, IToolPackageStore toolPackageStore, NuGetVersion packageVersion, PackageSourceLocation packageSourceLocation, Boolean includeUnlisted) at Microsoft.DotNet.Cli.ToolPackage.ToolPackageDownloader.<>c__DisplayClass8_0.<InstallPackage>b__0() at Microsoft.DotNet.Cli.TransactionalAction.RunT at Microsoft.DotNet.Tools.Tool.Restore.ToolRestoreCommand.InstallPackages(ToolManifestPackage package, Nullable1 configFile) at Microsoft.DotNet.Tools.Tool.Restore.ToolRestoreCommand.<>c__DisplayClass10_0.<Execute>b__0(ToolManifestPackage package) at System.Linq.Enumerable.SelectArrayIterator2.Fill(ReadOnlySpan1 source, Span1 destination, Func2 func) at System.Linq.Enumerable.SelectArrayIterator2.ToArray() at System.Linq.Enumerable.ToArrayTSource at Microsoft.DotNet.Tools.Tool.Restore.ToolRestoreCommand.Execute() at System.CommandLine.Invocation.InvocationPipeline.Invoke(ParseResult parseResult) at Microsoft.DotNet.Cli.Program.ProcessArgs(String[] args, TimeSpan startupTime, ITelemetry telemetryClient)

Answer 1

Hi @Kim Strasser, 

Welcome to Microsoft Q&A! 

Please clear NuGet caches with dotnet nuget locals all --clear and restore packages with dotnet restore. 

If it doesn’t work, please check your package source credentials in the nuget.config file. You can refer to the document to reset it. 

Sincerely,

Anna

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Answer 2

This solved the problem:

In Visual Studio, I opened Tools-->NuGet Package Manager-->Package Manager Settings.

Then I clicked on the button Clear all NuGet Storage in NuGet Package Manager-->General and then clicked on the Ok button.

And then I used this command in the VS Terminal:

dotnet nuget add source --username MyUsername --password MyPassword --store-password-in-clear-text --name MonoGame "https://nuget.pkg.github.com/MonoGame/index.json"