No 404 check

Remote web server does not reply with 404 error code.
This web server is [mis]configured in that it does not return '404 Not Found' error codes when a non-existent file is requested, perhaps returning a site map, search page or authentication page instead. OVS enabled some counter measures for that, however they might be insufficient. If a great number of security holes are produced for this port, they might not all be accurate