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The GFE development team was in the process of adding features to GFE to improve security and performance. These features had been introduced into the second layer GFE code base but not yet put into service. One of the features contained a bug which would cause the GFE to restart; this bug had not been detected in either of testing and initial rollout. At the beginning of the event, a configuration change in the production environment triggered the bug intermittently, which caused affected GFEs to repeatedly restart. Since restarts are not instantaneous, the available second layer GFE capacity was reduced. While some requests were correctly answered, other requests were interrupted (leading to connection resets) or denied due to a temporary lack of capacity while the GFEs were coming back online.
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