Flex - Security error accessing URL - ERROR#2042

I've built a flex Web-app that has a login in function. However the user information that it uses to verify the user is stored in a sqlserver DB on a different domain. For some reason i can only lo开发者_如何学编程g in on a certain machine and only with chrome, when i try with IE8 or on a different machine it outputs the 2042 error. I've thoroughly searched for the answer to this and have found that the problem is something to do with new versions of flash player and setting my cross-domain file.

<?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" />
   <allow-access-from domain="*" to-ports="*" secure="false" />
   <allow-http-request-headers-from domain="*" headers="*" secure="false" />
</cross-domain-policy>  

Hi Has your back end server a crossdomain.xml file? Or did you use the loadPolicyFile? Did you use allowDomain to explicitely allow the 2d domain?