Problem with crossdomain.xml file when trying to register to a database server

Hello everybody, I am having this problem for about two days now and I tried all the solutions that I could find online, but still no luck.
what is happening is that in my game, when I press a specific button I am supposed to register to a private database server of mine that is hosted in azure.
when running the build on IOS or Android I have no problem with registering, but in the Unit web player version I get a "Rejected because no crossdomain.xml policy file was found" error, even though I made sure that the file is located in the root of my server and is formatted ASCII, as written the sandbox guide.
I am only using the WWW class and no socket.
When I try registering from my localhost and from the unity editor i have no problems, but only when i upload the html file to an online host and access it through a url the problem occurs.

if anyone could help me find the problem it would be amazing. I have finished my game and it wirks perfectly on all platforms except the web player. thanks allot

 

Hi Graham, I tried debugging with ENABLE_CROSSDOMAIN_LOGGING=1 environment variable but nothing happened. where am I supposed to see the log? is it in the browse, or anywhere else maybe?