Well, here: http://zulu.zscaler.com/submission/show/8c76b8eb17ddc36eeadee40e24fb67df-1375991351

zulu is not completing scan for 411 site, but downforeveryoneorjustme is reporting site as live.

See attached:

I’d check for nested redirects within your site as this block occurred two seconds after loading the webpage when visiting by using scanned links from zulu.