# GitLab: Increased error rate for GitLab Duo Classic

- Impact (vendor’s label): major
- Status: resolved
- Started: 2025-12-22 15:38 UTC · Resolved: 2025-12-22 17:32 UTC · Duration: 1.9 h
- Updates: 4 · Affected components: GitLab Duo
- [Vendor status page: https://status.gitlab.com/pages/incident/5b36dc6502d06804c08349f7/694965e403be63052d1cf45a](https://status.gitlab.com/pages/incident/5b36dc6502d06804c08349f7/694965e403be63052d1cf45a)
- [Company: GitLab](https://rewindex.com/company/gitlab.md)

## Timeline of updates

- **investigating** 2025-12-22 15:38 UTC: We are seeing increased errors for Duo Classic. Users are experiencing Error Code: A1004. For full details, see https://gitlab.com/gitlab-com/gl-infra/production/-/issues/21032
- **investigating** 2025-12-22 16:01 UTC: We are seeing improvements in the error rate and are continuing investigations. For full details, see https://gitlab.com/gitlab-com/gl-infra/production/-/issues/21032
- **monitoring** 2025-12-22 16:29 UTC: We are seeing further improvement and are continuing investigations. As a possible workaround, switching to a different model can be used. Full details in https://gitlab.com/gitlab-com/gl-infra/production/-/issues/21032
- **resolved** 2025-12-22 17:32 UTC: We've completed our monitoring period and can confirm Duo Chat is back to operating normally. We appreciate your patience during this time. Full details in https://gitlab.com/gitlab-com/gl-infra/production/-/issues/21032

## Rewindex changes for this incident

- 2025-12-22 15:38 UTC: [Major incident: Increased error rate for GitLab Duo Classic](https://rewindex.com/change/i1d425e9fc8b138.md)


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Canonical: https://rewindex.com/company/gitlab/incidents/694965e403be63052d1cf45a · Markdown: https://rewindex.com/company/gitlab/incidents/694965e403be63052d1cf45a.md · JSON: https://rewindex.com/api/v1/companies/gitlab/incidents/694965e403be63052d1cf45a · Generated 2026-10-18T11:25:36.582Z