Do you mean "IE Plug-in"? If so, it connects to the server using QVP (port 4747) while AJAX uses HTTP (port 80).
If you're talking about AJAX in Firefox vs. Chrome vs. IE, that could be an issue also. The browsers handle authentication slightly differently and there may also be corporate IT policies restricting automatic login with one or more browsers.
Yes. The IE Plug-in is not working with a automatically login.
It works not with:
So I think the reason is the different Port as you wrote.
Thanks a lot