/cgi-sys/defaultwebpage.cgi is just the Account Queued page, if you're still seeing it try clearing your cache. Currently both links (with and without www) show me your homepage, though for some reason one is coming up without CSS formatting.
We do have automatic DoS protection that will keep the server online for everyone when one person is either knowingly or unknowingly causing downtime by opening too many connections. There is also automatic protection against guessing passwords that can lock you out of being able to log in if you continually try to log in with the wrong password.