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Resolved: Investigating an issue with elevated H99 Errors

ResolvedminorUnverified reportFirst recorded update Sep 25, 2025, 02:13 AM · Resolved Sep 25, 2025, 02:13 AM

Beginning at 23:17 UTC on September 24, 2025 and continuing until 00:39 UTC on September 25, 2025, impacted customers experienced elevated H99 errors on network runtime in US & EU. This issue is now resolved.

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What visitors reported during this incident

No visitor reports were filed for this incident.

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Timeline

No vendor updates were captured for this incident before it was resolved.

What to do next

  • Verify your own services recovered cleanly. Some upstream outages leave queues or caches in a degraded state, run smoke tests before declaring green internally.
  • Save the post-mortem. Vendors usually publish a detailed RCA 1-3 days later. We'll add it to this page when it appears.
  • Watch the provider going forward. Follow Heroku's status feed →

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