[reptilesandsamurai]

"In addition, no other internet connections appear to be having an issue accessing 4chan. This appears to negate any other possibility, that the access issue is due to some server or backbone failure or DNS update. If such issues were the culprit, it would be almost impossible for only AT&T customers to be having an issue, and AT&T customers would likely be unable to access any of 4chan, not specifically its most popular board."


This isn't exactly true. If there is a router at the LEC that has gone bad or a server lost it's host file it could cause certain portions to be unavailable with out effecting other portions of a website. A trace route with someone who has AT&T would show exactly where the failure happens.