Diagnosing NuGet Version Conflict Errors in .NET Solutions
Step‑by‑step diagnostic guide for resolving NuGet version conflict errors in .NET solutions, with checks, fixes, and verification tips.
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dotnetInconsistent package version resolution with floating version ranges in NuGet restore
When a project declares a dependency using a floating version range (for example, [1.0,) ), the NuGet restore process may resolve different applicable versions on different machines or after clearing the local cache, even when the same package sources are configured. This behavior appears to depend on factors such as the order in which package sources are qu
nugetUnable to resolve package source '...' caused by stale HTTP cache
Goal Identify whether a stale HTTP cache entry is the root cause of the generic “Unable to resolve package source ‘…’” error emitted during a restore. Constraints NuGet caches metadata responses under %userprofile%\.nuget\cache, keyed by URL and retaining ETag/Last‑Modified headers when supplied. When a source omits or modifies Cache‑Control headers, the cli
Source precedence limits for package IDs absent from NuGet source mapping
When multiple package sources are listed in NuGet.Config, NuGet evaluates them in the order they appear unless a source mapping section redirects a specific package ID. For package IDs that are not covered by source mapping, changing the order of sources can cause a restore to select a different version of the same package if the feeds expose different versi
project.assets.json lock file not rolled back after a failed NuGet package upgrade
Starting with NuGet 4.0, each restore operation writes a project.assets.json lock file that records the resolved package graph. When a restore fails part‑way through, the lock file can be left in a partially written or corrupted state. NuGet does not automatically rollback or invalidate this file, so subsequent builds fail until the lock file is removed or o