I have set the the cookie expiration time to 1 month but when I look the expiration timeout of .ASPXAUTH cookie in browser it says 30 minutes ahead from now.

```
var ticket = new FormsAuthenticationTicket(1, "myname", DateTime.Now,
                                                        DateTime.Now.AddMonths(1), true, "test");
string ticketString = FormsAuthentication.Encrypt(ticket);
var cookie = new HttpCookie(FormsAuthentication.FormsCookieName, ticketString)
                 {
                     Expires = DateTime.Now.AddMonths(1),
                     Path = FormsAuthentication.FormsCookiePath
                 };
HttpContext.Current.Response.Cookies.Add(cookie);

```

Can you let me know why the above code is behaving so, I want to change the expiration time but it is always coming 30 minutes.