asset bundle works fine on url1 but doesn't on url2?

Hey guys,

Ive been using WWW.LoadFromCacheOrDownload to get asssetbundles from my server. Everything works fine. Now when i shift the url to my clients server, www.error returns null(which means that the file download is complete), but i get an error saying "Failed to load asset bundle"

I have added cross domain.xml to the root of the server. I also make sure that the url is correct and no spelling or link errors. Ive also checked the file permissions ad those are same for both servers.

Any idea why this could be happening. Im using unity Pro 3.4.2 iOS.