Why GitHub Suddenly Blocked Unauthenticated Users in China – What Developers Need to Know

GitHub outage affecting unauthenticated users in China

On 2025-04-12 at 20:01 UTC GitHub experienced a service disruption that prevented access for users whose IP address originated from China and who were not logged in. The issue was caused by an unintended side‑effect of a configuration change on GitHub’s infrastructure.

“Due to a configuration change, an unexpected impact occurred, causing unauthenticated users in China to be unable to access GitHub.”

Impact

Authenticated (logged‑in) users could use GitHub normally.

Unauthenticated requests from Chinese IP ranges returned errors (e.g., 403/404) starting at 20:01 UTC on 2025-04-12.

The problem was resolved at 14:55 UTC on 2025-04-13.

Technical explanation

GitHub’s statement attributes the outage to a configuration change that unintentionally blocked traffic from Chinese IP blocks for anonymous sessions. The change was rolled back, and GitHub confirmed that the issue will not recur.

Mitigation recommendations for developers

Do not rely solely on a single foreign hosting service for critical source code.

Maintain local mirrors or self‑hosted Git repositories within China to reduce dependency on external connectivity.

Consider using VPN or other network paths for unauthenticated access if needed.

Code example

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