Session Cookie is removed before session times out

I have a site that is using a session cookie to keep a few pieces of information but for some reason it seems to get removed before the time out.

In the global.asax I have

 void Session_Start(object sender, EventArgs e)
        {
            HttpCookie jobTrax = Request.Cookies.Get("JobTrax");
            if ((null != jobTrax))
            {
                if (Request.Cookies["JobTrax"] != null)
                {
                    HttpCookie myCookie = new HttpCookie("JobTrax");        
                    myCookie.Expires = DateTime.Now.AddDays(-1d);
                    Response.Cookies.Add(myCookie);
                }
                Context.GetOwinContext().Authentication.SignOut();          
                Session.Abandon();
                Session.RemoveAll();
                Response.Redirect("~/Account/Login",false);
            }           
        }

and in the web.config I have SessionState timeout = 30

This works perfectly when I am in my local environment but when I move the web forms app to either our test or development servers after about 2 minutes of no activity if I click a button or do anything on the site I get redirected to the login screen.

I am using asp.net 4.5 with the new identity. an I do not have the <authentication> tag in my web.config.  Is it possible my authentication is timing out and that is what is causing the redirect to my login screen which then removes my cookie?