McAfee SiteAdvisor - cannot verify due to 404 status codes in the head

We are trying to verify our dolphin site with McAfee SiteAdvisor.   We received the following message.  Anyone know how to change the configuration of the system  to support 404 status codes in the headers for pages that do not exist ?

"We cannot verify a Web site that is configured this way because it allows anyone to verify themselves as the owner of your site. Please update your Web site server configuration to return 404 status codes in the headers for pages that do not exist. Once your site is configured this way then you can return and request a file name verification."

I would avoid anything that has to do with McAfee. They suck and their site advisor sucks the worst of all.

Don't call attention to yourself with that site advisor. They like to get site owners to join and comment about their site, then give them a bad rating afterwards. I know, that's exactly what they did to me & I've found others who had the exact same thing happen. They don't do anything to resolve bad ratings either. They will just ignore you.

My site showed as perfectly fine *until* I signed up. Screw them.

McAfee should be on a list of malware themselves.

Use http://brightcloud.com/ - at least if you get an unfounded bad rating they will fix it quickly.