Well, they ARE primarily a PiU board. They do have an O2jam section, it's a members only section, with a password (o2jam). So you need to register.
Are you trying to use o2lx, or the custom launcher they have?
And the server could be down. Their policy is "it's a free service, we'll fix it when we find out it's down, it could be down for any reason, we don't know what we'll have to do to fix it, or when it'll be back up. Now shut up and be patient."