IE, ajax and "no transport": $ .support.cors = true does not work either

You know the exercise ... Firefox and Chrome are fine. IE raises my blood pressure :)

I did a lot of searching, and 90% of what I read says that adding $.support.cos = true;just before the request $.ajaxshould fix the cross-domain IE problem.

Unfortunately, this does not seem to be the case. I still get no transport. Therefore, here I am looking for any other suggestions, ideas, etc.