Crossdomain.xml

I know there’s a ton on this in the forums and google, but I’m not finding the answer (if it exists).

The server I’m trying to load xml/images/mp4s from has this crossdomain.xml:

<?xml version=“1.0”?>
<!DOCTYPE cross-domain-policy SYSTEM “http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd”>
<cross-domain-policy>
<site-control permitted-cross-domain-policies=“all”/>
</cross-domain-policy>

But, I get the Security error. I tried loading the file, tried setting allowscriptaccess to always, tried allow network access.

Does that file need to contain
<allow-access-from domain=“mydomain.com”/>
to work or am I missing something?

thanks!