LinkedIn outage was due to DNS records misconfiguration
Posted on 21 June 2013.
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The mystery of the LinkedIn outage has been revealed: Network Solutions, its DNS provider, has been battered by a DDoS attack and while defending itself, misconfigured the DNS records of some of its customers - including that of LinkedIn.

"We are proactively working with these customers and have resolved most issues, none of which involved malicious activity," Network Solutions let everyone know on Thursday. "No confidential data was compromised, including passwords, credit card information, or cookies."

The fact was confirmed esearchers at Cisco have noticed that a number of organizations registered under NS had problem with their domain names, and nearly 5000 were apparently affected.

"Interestingly, several of these domains were setup under different nameservers at For example, the domain was pointed to the DNS nameservers and Yelp had their nameservers changed to and Fidelity, meanwhile, was pointed at and, pointed out Cisco researcher Jaeson Schultz.

"However, the fact that so many domains were displaced in such a highly visible way supports Network Solutions’ claim that this was indeed a configuration error."

Users that have domains registered with NS are advised to check whether their DNS nameservers are working as the should and are pointing to the correct address.


Attackers use reflection techniques for larger DDoS attacks

Posted on 17 April 2014.  |  Instead of using a network of zombie computers, newer DDoS toolkits abuse Internet protocols that are available on open or vulnerable servers and devices. This approach can lead to the Internet becoming a ready-to-use botnet for malicious actors.

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