# Documentation sites with a custom domain returned a 404 error

- Provider: [GitBook](https://down.guide/gitbook)
- Level: confirmed
- Impact: Partial outage
- lasted 0m
- started 2026-03-06 16:56 UTC
- id: DWN-1a9c8bee0b
- Official page: https://www.gitbookstatus.com/incidents/01KK219E7DFDQZ9TYYQ7BGMFGA

## Updates from GitBook
### 2026-03-06 14:36 UTC: resolved
Between 14:36 and 14:43 UTC, all GitBook documentation sites using a custom domain were returning a 404 "Not Found" error, making documentation unavailable to users. The issue was caused by a problem introduced by an upstream provider that affected our deployment. The incident was resolved by rolling back the deployment, after which all sites were confirmed to be fully operational.

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