Its the same for me and i'm on sky b/band in the UK (*.bb.sky.com)
Whats basically happened is that someone from your isp has been on the irc channel and got themselves banned, they probably tried to get back in under a different nickname so their (and yours and mine) ISP was blanket banned.
I've pm/msged mods previously about this and had zero reply. I gave up trying to log in a long time ago and have resigned myself to not being able to help out testing. i guess i'll have to wait for the finished release before i get to try it out
anyways, boy did this get off topic! congrats on reaching the mile stone of stress testing