Troubleshooting Installed Packages

Sometimes you might want to validate which source a specific package was installed from. Here are some ways you can check.

Note

Some package sources support a concept known as upstream sources. For example, Azure Artifacts upstream sources. NuGet clients do not know whether a package came from an upstream source. Therefore, any logging of the package source will list the configured source, not the upstream source.

.nupkg.metadata file in global packages folder

When a package is extracted into the global-packages folder, a file .nupkg.metadata is written. Starting from NuGet 5.9.0, NuGet will add the package source. See below to map NuGet versions to Visual Studio or .NET SDK versions. For example:

{
  "version": 2,
  "contentHash": "bw3R9q8cVNhWXNpnvWb0OGP4HadS4zvClq+T1zf7AF+tLY1haZ2AvbHidQekf4PDv1T40c6brZeT/V0IBq7cEQ==",
  "source": "https://api.nuget.org/v3/index.json"
}

Note

If your global-packages folder has packages extracted before you upgraded to a newer version of tools that has NuGet 5.9.0, the .nupkg.metadata file will be version 1 and will not contain the package source. You can clear your global-packages folder to ensure all packages will contain the package source.

Tip

NuGet writes the .nupkg.metadata file to the global-packages folder only. Projects using packages.config use a solution packages folder, which does not create a .nupkg.metadata file.

Installed package log message

Starting from NuGet 5.9.0, NuGet outputs the package source in the restore message informing that a package was installed. For example:

Installed Moq 4.16.1 from https://api.nuget.org/v3/index.json with content hash bw3R9q8cVNhWXNpnvWb0OGP4HadS4zvClq+T1zf7AF+tLY1haZ2AvbHidQekf4PDv1T40c6brZeT/V0IBq7cEQ==.

Tip

This message is output at normal/informational verbosity. Visual Studio and the dotnet CLI default to minimal verbosity, so this message will not be visible by default. The msbuild and nuget CLI tools default to normal verbosity, so this message will be visible by default.

HTTP log message

When a package is not available locally, either in the global-packages folder, a fallback folder, or a local file source, NuGet will download it from any configured package source over HTTP. HTTP requests and responses are logged at the normal verbosity level, and you should see only a single request and response per package version. For example:

info :   GET https://api.nuget.org/v3-flatcontainer/moq/index.json
info :   OK https://api.nuget.org/v3-flatcontainer/moq/index.json 56ms
info :   GET https://api.nuget.org/v3-flatcontainer/moq/4.16.1/moq.4.16.1.nupkg
info :   OK https://api.nuget.org/v3-flatcontainer/moq/4.16.1/moq.4.16.1.nupkg 3ms

If the files were recently downloaded, they might be retrieved from NuGet's http-cache

CACHE https://api.nuget.org/v3-flatcontainer/moq/index.json
CACHE https://api.nuget.org/v3-flatcontainer/moq/4.16.1/moq.4.16.1.nupkg

The URL format may be different for different NuGet HTTP server implementations, and whether it's implementing NuGet V2 or V3 HTTP protocol.

If your nuget.config has multiple HTTP sources defined, you will see multiple requests to each package's index.json file, one for each source. But there will be only a single nupkg download for each version of the package.

Package signature log message

If the package being downloaded is signed, NuGet will validate the signature and will log the following message at detailed verbosity:

PackageSignatureVerificationLog: PackageIdentity: Moq.4.16.1 Source: https://api.nuget.org/v3/index.json PackageSignatureValidity: True

This message will be reported whether the package was downloaded from an HTTP package source, or copied from a local package source. It will not be output if the package is already available in the global-packages folder or a fallback folder.

Important

Due to removal of trust of VeriSign CA NuGet has disabled signed package verification on certain platforms, in certain versions of NuGet and the .NET SDK. Therefore, the same packages may have PackageSignatureVerificationLog logs, or those logs may be missing, depending on what platform you're running restore on, and which version of .NET or NuGet you're using.

NuGet Version Map

The following versions of NuGet have important changes regarding package source logging:

NuGet Version	Visual Studio Version	.NET SDK Version
NuGet 5.9.0	Visual Studio 2019 16.9.0	.NET 5 SDK 5.0.200