NuGet Warning NU3021

Scenario 1

Package 'SamplePackage v1.0.0' from source 'https://contoso.com/index.json': The primary signature's timestamp signature validation failed.

Issue

NuGet client failed to verify the SignedCms object inside the timestamp on the package signature.

Solution

Please request the package author to re-sign the package using the nuget sign command as described in NuGet docs. If the problem persists, request the package author to contact the Timestamp Authority to discover the source of the problem.

Scenario 2

Package 'SamplePackage v1.0.0' from source 'https://contoso.com/index.json': The timestamp signature validation failed.

Issue

The SignedCms object inside the timestamp on the package signature could not ve verified.

Solution

Please try to re-sign and timestamp the package. If the problem persists, contact the Timestamp Authority to discover the source of the problem.