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.
What I would like to know is, can't they just manually eject everyone from the servers to simply bypass the error? Also, if this hasn't happened in the prior phases, doesn't it establish that perhaps a full server takedown and check is in order? It's obvious this isn't a small problem, and it seems that having people still on isn't helping the situation. It's beta still, this is where you shit on people's parades and fix the problems, not at retail.