Forms authentication stopped working IE8

I'm using IE 8 v.8.0.6001.18882
After upgrading ie my login form that uses forms authentication stopped working.
After studies find that IE8 has problems with the authentication cookies.
With all other browsers work perfectly.
My settings in web.config.
<sessionState mode="InProc" cookieless="AutoDetect" timeout="280"/>
    <authentication mode="Forms">
      <forms name="form1"
                loginUrl="Login.aspx"
                timeout="280"
                sli ...