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NuGet Package Restore Failed — Visual Studio Dependency Resolution Errors

Warningapplication

Overview

Fix NuGet package restore failures in Visual Studio caused by missing package sources, version conflicts, authentication issues, and proxy configurations.

Key Details

  • NuGet package restore downloads project dependencies before building in Visual Studio
  • Restore failure causes cascading build errors — 'type or namespace not found' for every dependency
  • Package sources can be nuget.org, private feeds, or local directories
  • Package version conflicts between projects in the same solution cause restore failures
  • Authentication is required for private NuGet feeds (Azure DevOps, GitHub Packages, JFrog)

Common Causes

  • nuget.org unreachable due to network issues, proxy, or firewall blocking
  • Private NuGet feed credentials expired or not configured
  • Package version conflict: two projects requiring incompatible versions of the same package
  • packages.config or .csproj referencing a package version that does not exist on any configured source

Steps

  1. 1Check NuGet sources: Visual Studio > Tools > NuGet Package Manager > Package Manager Settings > Package Sources — verify nuget.org is listed
  2. 2Clear NuGet cache: 'dotnet nuget locals all --clear' in terminal, or Tools > NuGet Package Manager > General > Clear All NuGet Cache(s)
  3. 3Restore from command line: 'dotnet restore' in the solution directory for detailed error output
  4. 4For private feeds: configure credentials in Visual Studio or nuget.config file
  5. 5Resolve version conflicts: use Directory.Packages.props (Central Package Management) to enforce consistent versions

Tags

nugetpackage-restorevisual-studiodependenciesdotnet

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windows-visual-studio-build-error-msbuild

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Frequently Asked Questions

Global packages: %USERPROFILE%\.nuget\packages. HTTP cache: %LOCALAPPDATA%\NuGet\v3-cache. Temp: %LOCALAPPDATA%\NuGet\Temp. Clear all with 'dotnet nuget locals all --clear'.