Ever have those days at work where everything goes wrong with your computer and it just goes downhill from there? Ragnar Kårhu, CEO of Telenor Norway, has just written to the Norwegian Post and Telecommunications Authority to explain his awful day at the office, June 10th 2010.
Following disruptions in service (that affected some subscribers) the MNO chose to upgrade and restart a server used for mobile broadband. Soon after the server came back online other servers started having problems with signalling traffic, being the data streams which bounce around between internal servers. The traffic volume increased beyond the systems abilities and subscribers were knocked out of operation.
Eventually they tracked down a rogue server and restarted it which reversed the problem. Following this they carried out the same restart across their server network.
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