AT&T says 4chan.org block was security-related

Telco says 4chan was used to launch denial of service attacks

AT&T now says that it blocked portions of the popular 4chan.org bulletin board because it was being used as a base to launch distributed denial of servioce (DDoS) attacks against one of its customers.

The company says that its actions were solely based on sound network management practices and have nothing to do with objecting to content posted on the img.4chan.org message boards. The block was first reported Sunday, when AT&T subscribers found they could not access certain portions of the 4chan.org bulletin boards. The block was lifted late last night after AT&T determined that "the denial-of-service threat no longer existed" and said it would continue to monitor the situation.

AT&T's decision to block portions of the site caused a flurry of angry commentary from users who speculated that the carrier was blocking the site due to its content. Adding to the confusion was the fact that 4chan.org founder Christopher "moot" Poole said that as of yesterday the company hadn't contacted him about its reasons for blocking parts of his site. Poole also advised 4chan users to "call or write customer support and corporate immediately" to complain about the blocking.

AT&T's statement on the blocking is notable because it tries to directly refute accusations that it blocks access to websites based on their content. Erling L√łken Andersen, the CEO of the Norwegian social networking site Biip.no, got the ball rolling Sunday when he speculated that that AT&T was "firing one of the first shots in the net neutrality war" by blocking the site.

Meanwhile, the Tech Herald reported that several users took AT&T's actions to be related to network neutrality and not related to legitimate network management concerns.

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