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HMH Outage History

Every past HMH outage tracked by IsDown, with detection times, duration, and resolution details.

There were 24 HMH outages since July 2024. The 15 outages from the last 12 months are summarized below, with incident details, duration, and resolution information.

Minor March 10, 2026

March 2026: Classcraft on Ed

Detected Mar 10, 2026 11:07 AM EDT · Resolved Mar 11, 2026 12:05 PM EDT · Duration 1 day

Classcraft was not visible on the Ed platform for 25 hours, affecting the Content and Resources component. HMH engineering teams identified the root cause and implemented a fix to restore access for impacted users. The incident was resolved after a monitoring period to ensure stability.

Minor February 20, 2026

February 2026: Content on Waggle

Detected Feb 20, 2026 1:59 PM EST · Resolved Feb 23, 2026 10:06 AM EST · Duration 3 days

HMH experienced an issue where some content on Waggle was not loading properly, affecting the Content and Resources components. The incident lasted 68.1 hours, during which engineering teams identified the root cause and implemented a fix. The issue has been fully resolved.