# ChatGPT: Authentication errors for some users

- Impact (vendor’s label): major
- Status: resolved · edited after publishing
- Started: 2026-10-20 16:35 UTC · Resolved: 2026-10-20 17:35 UTC · Duration: 1.0 h
- Updates: 2 · Affected components: Login, Login, Codex Web, CLI, VS Code extension, Codex API
- [Vendor status page: https://status.openai.com/incidents/01M5G9QQ9V4CYDWFRYF9BWZ5GG](https://status.openai.com/incidents/01M5G9QQ9V4CYDWFRYF9BWZ5GG)
- [Company: ChatGPT](https://rewindex.com/company/chatgpt.md)

## Timeline of updates

- **investigating** 2026-10-20 16:35 UTC _(edited after publishing)_: Some users near Illinois experienced authentication errors with the API, ChatGPT, and Codex.
- **resolved** 2026-10-20 17:35 UTC _(edited after publishing)_: On October 20, from 9:35 to 10:35 a.m. PDT, some users near Illinois experienced authentication errors with the API, ChatGPT, and Codex. We rolled back a configuration change, and service was restored.

## Rewindex changes for this incident

- 2026-10-20 16:35 UTC: [Major incident: Authentication errors for some API users](https://rewindex.com/change/i01f64aedfdbfc7.md)
- 2026-10-21 23:13 UTC: [Incident silently edited: Authentication errors for some users](https://rewindex.com/change/r1bda5be66b8023.md)


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Canonical: https://rewindex.com/company/chatgpt/incidents/01M5G9QQ9V4CYDWFRYF9BWZ5GG · Markdown: https://rewindex.com/company/chatgpt/incidents/01M5G9QQ9V4CYDWFRYF9BWZ5GG.md · JSON: https://rewindex.com/api/v1/companies/chatgpt/incidents/01M5G9QQ9V4CYDWFRYF9BWZ5GG · Generated 2026-10-22T06:19:48.137Z