What Really Caused Skype’s Worldwide Outage?

December 28, 2010 by · 1 Comment
Filed under: IT News 

UPDATE 3-1-2011: Skype eventually posted a detailed explanation here, which satisfied most of my previous doubts. This post has been kept as a historical reference.


Millions of people around the world use Skype┬áto make cheap phone calls over the Internet. That’s why when their service went down for two days last week, it made headlines all over the world.┬áThe outage was reported to have started on Wedneday, 22nd December at 9am PST (Thursday 23rd December 4am here in Sydney).

I am also a Skype user and both my Windows client and Android client on my smart phone reported my status as being offline, with none of my regular contacts visible. It went back to normal for me when I logged in on Friday morning.

Skype’s Official Explanation

On Skype’s blog, their official announcement stated:

“Under normal circumstances, there are a large number of supernodes available. Unfortunately, today, many of them were taken offline by a problem affecting some versions of Skype. As Skype relies on being able to maintain contact with supernodes, it may appear offline for some of you.”

What is a Supernode?

For those that don’t know what a supernode is, any computer that is running the Skype client can be automatically appointed a supernode, in which it acts like a hub and helps other nearby Skype users to find each other. The reason for this is due to the fact that some of Skype’s functionality is decentralised, using a Peer-to-Peer (P2P) topology. so having supernodes improves the efficiency of network communication. Computers with broadband connections that are not behind firewalls are likely to be chosen to act as supernodes.

Why I don’t believe Skype’s Official Explanation

I do not believe Skype’s explanation for the following reasons:

  1. As far as I know, all users were affected around the world, not just “some”
  2. If the problem was limited to a single defective version, you would only expect some contacts to be unreachable, not all of them
  3. If the problem only affected some versions of Skype, all the other clients running the good versions would still be able to operate as supernodes, allowing Skype to function
  4. Why would the problem hit so many systems at once, at the same time? Surely, they are not implying that millions of people around the world suddenly switched to defective versions! Something must have triggered it

My Alternative Theory

If I were to make a guess at the cause, it looks more like a carefully planned Denial-Of-Service attack. A malicious person may have found a weakness in Skype’s protocol or software, obtaining a list of IP addresses of all supernodes who were on the network at that time, and then sending those supernodes specially crafted data to cause a software failure.

Perhaps their protocol has little or no redundancy to protect against supernode malfunction, i.e. all the skype users known to a single supernode will be lost to the rest of the network if that single supernode fails. This would not happen if the system were designed so that each user is registered with two or more supernodes.

The motivation would be to cause Skype embarrassment at Christmas time, when many people are making long-distance phone calls to relatives, friends and business associates. The perpetrator could be a business rival, online extortionist, or simply some troublemaker with nothing better to do with their time. It is known that Skype is trying to attract large corporations as clients, and an outage of this scale would really cause people to lose confidence in the reliability of their platform.

This is just speculation on my part. I have no direct knowledge of the Skype protocol, and I have no evidence of foul play, but I sure as hell do not believe Skype’s explanation.

My Take on the Wikileaks Cablegate Controversy

December 10, 2010 by · Leave a Comment
Filed under: International News 

I do not condone what Julian Assange and Wikileaks have done by releasing classified US diplomatic cables, but I do not condemn it either.

Diplomacy is a sensitive area and sometimes sensitive issues, especially where there is huge difference between both sides, or are controversial, need to be discussed quietly outside the public eye. For example, meeting with a belligerent force to negotiate a ceasefire, surrender or peace treaty.

But where is the accountability? When is it okay for our politicians and bureaucrats to tell lies, and when does it cross the line? How does the voting public know? How can the public judge the effectiveness and competence of our government without knowing the truth.

When Scotland released the Lockerbie bomber Abdel Baset al-Megrahi, I knew that something was amiss. Although he reportedly was dying of prostate cancer and only had months to live, prisons do not usually hesitate to let someone die in prison, especially one convicted of mass murder.

It was clear that the West wanted to benefit from Libya’s petrol money (they have nothing else to offer), which is controlled by the whim of madman Muammar Gadhafi. Now, thanks to Wikileaks, we have some insight into the matter.

Other matters of interest are the fact that Arab countries wanted military action against Iran, Saudi Arabian royalty enjoy parties with liquor and prostitutes whilst ordinary folk get lashed or stoned to death.

Julian Assange is only responsible for publishing, but not the actual leaking. It is the people who are leaking the information that are deciding for themselves whether something should be leaked. The only controversy that Julian Assange could be legitimately questions about is if he is releasing some information but not others, then he could be proven to have an agenda. Kind of like when CNN admitted that they had kept quiet about the most brutal actions taken by the former Iraqi dictator, Saddam Hussein.

Also, isn’t it amazing how VISA, Mastercard, Paypal, Amazon and other organisations quickly stopped handling money transfers (or web hosting). Never before have I seen this kind of action by these symbols of capitalist freedom in any other matter, be it terrorism or child pornography.

Malcolm Turnbull had something interesting to say about making a martyr out of Julian Assange as well.

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