It's an aggressive anti-DDoS solution that we have in place that looks for IPs that are a little too "active". Too many concurrent connection attempts with the server sets off the auto-ban. That's why I was asking if you had any kind of browser speed tweaks installed, such as fasterfox or an IE tweak that ups the connections over the standard 8. Unfortunately, it's something we have to use just to keep the server running, with these DDoS attacks going on constantly (which is also why we have so many DB errors).