# Netlify: Percentage of builds on older build image versions failing due to SSL errors

> Netlify status incident “Percentage of builds on older build image versions failing due to SSL errors” on 2021-09-30: impact minor (vendor’s label), 2.5 h, 1 update(s). Archived by Rewindex.

Canonical: https://rewindex.com/company/netlify/incidents/l6rk7f1hqfd7
Last updated: 2021-09-30T18:43:00Z

- Impact (vendor’s label): minor
- Status: resolved
- Started: 2021-09-30 16:12 UTC · Resolved: 2021-09-30 18:43 UTC · Duration: 2.5 h
- Updates: 1
- [Vendor status page: https://www.netlifystatus.com/incidents/l6rk7f1hqfd7](https://www.netlifystatus.com/incidents/l6rk7f1hqfd7)
- [Company: Netlify](https://rewindex.com/company/netlify.md)

## Timeline of updates

- **resolved** 2021-09-30 18:43 UTC: We've resolved the issue in our Xenial version build image, and the fix for the few affected builds using our Trusty build image will be to update to Xenial or Focal. The root cause for this incident was a missing root certificate within our OS certificate chain for Xenial and Trusty, which resulted in build failures for users whose yarn versions weren't cached. If you're still having trouble with builds, please follow up via the helpdesk by emailing support@netlify.com if you are a paying customer, or this forum thread: https://answers.netlify.com/t/ways-to-work-around-ssl-caused-build-failures-server-certificate-verification-failed/44945

_From the vendor’s published history: only the final update text is available for incidents before Rewindex began polling this page._

## Cite this

Status incident (vendor impact label: minor) posted by Netlify, started 2021-09-30 16:12 UTC, resolved after 2.5 h, 1 update(s).

- Canonical URL: https://rewindex.com/company/netlify/incidents/l6rk7f1hqfd7
- Citation: Netlify, “Percentage of builds on older build image versions failing due to SSL errors” (2021-09-30 16:12 UTC). Archived by Rewindex: https://rewindex.com/company/netlify/incidents/l6rk7f1hqfd7 (CC BY 4.0).
- Markdown link: `[Netlify: Percentage of builds on older build image versions failing due to SSL errors (2021-09-30)](https://rewindex.com/company/netlify/incidents/l6rk7f1hqfd7)`


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Canonical: https://rewindex.com/company/netlify/incidents/l6rk7f1hqfd7 · Markdown: https://rewindex.com/company/netlify/incidents/l6rk7f1hqfd7.md · JSON: https://rewindex.com/api/v1/companies/netlify/incidents/l6rk7f1hqfd7 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-05T17:20:29.582Z