I had Wordfence installed and everything worked perfectly. After the upgrade to version 3.02 the entire website was locked out - the administrative website, anonymous access, etc.
I deleted the Wordfence plugin directory and everything worked fine. I then installed the Wordfence plugin and then uninstalled (without activating). I then installed the Wordfence plugin and activated. Just after activating the website gave the 503 error "Your access to this service has been temporarily limited. Please try again in a few minutes. (HTTP response code 503)".
Without the Wordfence plugin the website works normally. Any ideas?