IE10 form authentication problem

Hi,

I use forms authentication in my web application.

I am trying to log in to my web application from a computer that belongs to "WORKGROUP" USING IE10. I set username and password, clicking the "login" button, and I see in wireshark that a cookie is created but not passed to the next request so the user gets the login page again and again....

In domain computers everything works fine (and in other browsers..)

Do you have any idea why?