GitHub Service Outage: Git Operations Failed Due to Expired TLS Certificate

wilhelmklopp

6mo ago· 3 min readenNews

65/100

Toasty

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A respectable bake. You'd come back tomorrow for another.

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Summary

GitHub experienced a service outage from November 18, 2025, 20:30 UTC to 21:34 UTC affecting all Git operations including SSH and HTTP client interactions, as well as raw file access. The incident also impacted products relying on Git operations. The root cause was an expired TLS certificate used for internal service-to-service communication. The issue was resolved by replacing the expired certificate and restarting impacted services, leading to full recovery.

Key quotes

· 4 pulled

From Nov 18, 2025 20:30 UTC to Nov 18, 2025 21:34 UTC we experienced failures on all Git operations, including both SSH and HTTP Git client interactions, as well as raw file access.

The root cause was an expired TLS certificate used for internal service-to-service communication.

We mitigated the incident by replacing the expired certificate and restarting impacted services.

Once those services were restarted we saw a full recovery.

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GitHub's Status Page - Git operation failures.

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