XmlHttpRequest status 0 instead of 401 in IE 10

Question

I have hit a wall with this issue. I guess it is some kind of IE bug but I want to be sure.

So the question is. Why does IE10 XmlHttpRequest.status returns 0 instead

Answer 1

I just ran into this problem today. After trying a few workarounds, and some Googleing, I ended up here. It turned out to just be a security level settings. Whatever security zone your website is in (Internet Options > Security) make sure you ENABLE the following setting in your zone: Miscellaneous > Access data sources across domains.