Introduction

A repository migration can move packages successfully while developers and CI jobs still install or publish through the old registry URL. The new artifact repository may already contain the right packages, but builds continue failing, publishing to the wrong place, or pulling stale versions because one client, scope, or token still points at the retired registry.

Treat this as a package-source problem instead of a generic dependency outage. Start by checking which registry URL the failing client actually uses, because artifact migrations often copy the packages correctly while local config, scoped registry settings, or CI secrets continue directing traffic to the old repository.

Symptoms

  • Package install or publish jobs start failing after a registry migration
  • CI or developer machines still connect to the old artifact repository
  • Some packages resolve correctly while scoped packages still use the previous registry
  • Publishing appears successful, but the new repository never receives the package
  • Authentication works in one environment but fails in another after cutover
  • The issue started after moving npm, PyPI, Maven, NuGet, or another artifact registry to a new platform

Common Causes

  • Client config still uses the old registry URL or scoped repository setting
  • CI secrets or environment variables still contain tokens for the retired registry
  • A global config file overrides the project-level registry definition
  • One publish path was updated while install paths still reference the previous repository
  • Proxy, mirror, or virtual repository settings still route requests to the old backend
  • Validation confirmed package availability in the new repository but not the live client configuration that consumes it

Step-by-Step Fix

  1. Capture one failing install or publish attempt and record the exact registry URL, scope, and authentication path the client uses, because the live package source matters more than the repository you expected everyone to be using.
  2. Compare that active registry target with the intended post-migration repository, because one stale URL in a user profile, project config, or pipeline variable can keep the workflow tied to the retired platform.
  3. Review project-level config, user-level config, global config, and CI secrets for any remaining reference to the old registry, because package managers often merge settings from more than one layer.
  4. Check scoped package rules, mirrors, and virtual repositories if only part of the dependency tree is affected, because a migration can fix the default registry while one namespace still routes to the old source.
  5. Update the authoritative registry configuration and tokens for the affected workflow, because changing only one machine does not fix build agents or shared developer tooling that still restores the old values.
  6. Retry the same install or publish operation and confirm the client now talks to the intended repository, because a successful login to the new platform does not prove package resolution is coming from the right place.
  7. Verify the old registry no longer receives package requests from the migrated workflow, because silent fallback or partial routing can leave the migration only half complete.
  8. Review related automation such as lockfile generation, image builds, or release jobs if they also fetch or publish packages, because registry cutovers often leave secondary consumers behind.
  9. Document which config layers, secrets, and repository endpoints own package resolution for the environment, because artifact migrations often fail when registry ownership is spread across tools and teams.