In all fairness, we have NO idea what's creating this issue, so assuming that it's something as basic as you say Anuubis is a little cocky. 20,000+ people getting the same error for over 24 hours can't be as simple as you or any of us think, otherwise we'd all be making money hand over fist by running our own MMO.
Sorry D, I disagree. It literally IS that obvious. Also, with computers, the hardest problems are those that the fewest people have, not the other way around.
Why it hasn't been fixed yet is mostly because every solution does take time. As they said in a Twitter update, they are adding more servers to lessen the load.
Getting the servers, ghosting them, adding them to the matrix... that's a lot of work especially because those servers aren't in Japan, so you have to consider that delay too.
Fixing the actual problem requires going in the code and making a new load. Fixing + compiling + deploying in less than 48 hours would have been pretty surprising.