Today, Skype CIO Lars Rabbe detailed what caused the Skype outage:
What was the cause for the failure?
On Wednesday, December 22, a cluster of support servers responsible for offline instant messaging became overloaded. As a result of this overload, some Skype clients received delayed responses from the overloaded servers. In a version of the Skype for Windows client (version 5.0.0152), the delayed responses from the overloaded servers were not properly processed, causing Windows clients running the affected version to crash.
Users running either the latest Skype for Windows (version 5.0.0.156), older versions of Skype for Windows (4.0 versions), Skype for Mac, Skype for iPhone, Skype on your TV, and Skype Connect or Skype Manager for enterprises were not affected by this initial problem.
However, around 50% of all Skype users globally were running the 5.0.0.152 version of Skype for Windows, and the crashes caused approximately 40% of those clients to fail. These clients included 25–30% of the publicly available supernodes, also failed as a result of this problem.
Tags: Failure, iPhone, outage, Peer-to-peer, Skype, supernode
Related tags: skype windows, version skype, overloaded servers, responses overloaded, versions skype, skype
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