On April 15, 2025 from 12:45 UTC to 13:56 UTC, access to GitHub.com was restricted for logged out users using WebKit-based browsers, such as Safari and various mobile browsers. During the impacting time, roughly 6.6M requests were unsuccessful.
This issue was caused by a configuration change intended to improve our handling of large traffic spikes but was improperly targeted at too large a set of requests.
To prevent future incidents like this, we are improving how we operationalize these types of changes, adding additional tools for validating what will be impacted by such changes, and reducing the likelihood of manual mistakes through automated detection and handling of such spikes.
Posted Apr 15, 2025 - 14:12 UTC
Update
Safari users are now able to access GitHub.com.
The fix has been rolled out to all environments.
Posted Apr 15, 2025 - 14:11 UTC
Update
Most unauthenticated Safari users should now be able to access github.com. We are ensuring the fix is deployed out to all environments.
Next update in 30m.
Posted Apr 15, 2025 - 13:59 UTC
Update
We have identified the cause of the restriction for Safari users and are deploying a fix. Next update in 15 minutes.
Posted Apr 15, 2025 - 13:46 UTC
Update
Some unauthenticated Safari users are seeing the message "Access to this site has been restricted." We are currently investigating this behavior.