In its official blog the company said that “We don’t blame anyone but ourselves. The Microsoft Update patches were merely a catalyst — a trigger — for a series of events that led to the disruption of Skype, not the root cause of it. And Microsoft has been very helpful and supportive throughout.” The problems caused a prolonged outage – which started on the 16 th of August – which made it impossible for millions of Skype users across the globe to make use of the service.<\/p>\n
“The high number of post-update reboots affected Skype’s network resources. This caused a flood of log-in requests, which, combined with the lack of peer-to-peer network resources at the time, prompted a chain reaction that had a critical impact,” Skype said.<\/p>\n
“The self-healing mechanisms of the P2P network upon which Skype’s software runs have worked well in the past. Simply put, every single time Skype has needed to recover from reboots that naturally accompany a routine Windows Update, there hasn’t been a problem.”<\/p>\n
The company goes on to say that the exceptional situation made it very difficult to solve the problems.<\/p>\n
“Unfortunately, this time, for the first time, Skype was unable to rise to the challenge and the reasons for this were exceptional. In this instance, the day’s Skype traffic patterns, combined with the large number of reboots, revealed a previously unseen fault in the P2P network resource allocation algorithm Skype used.”<\/p>\n
“Consequently, the P2P network’s self-healing function didn’t work quickly enough. Skype’s peer-to-peer core was not properly tuned to cope with the load and core size changes that occurred on August 16. The reboots resulting from software patching merely served as a catalyst. This combination of factors created a situation where the self-healing needed outside intervention and assistance by our engineers.”<\/p>\n
Skype made it clear that the problems have now been solved. “The bug has been squashed. The parameters of the P2P network have been tuned to be smarter about how similar situations should be handled,” the Skype blog points out.<\/p>\n