البته به طور دستی تونستم این مورد رو موقتا برطرف کنم
FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(
1, // ticket version
admin.UserName, // authenticated username
DateTime.Now, // issueDate
DateTime.Now.AddMinutes(30), // expiryDate
true, // true to persist across browser sessions
"", // can be used to store additional user data
FormsAuthentication.FormsCookiePath); // the path for the cookie
// Encrypt the ticket using the machine key
var encryptedTicket = FormsAuthentication.Encrypt(ticket);
// Add the cookie to the request to save it
var cookie = new HttpCookie(FormsAuthentication.FormsCookieName, encryptedTicket) {HttpOnly = true};
Response.Cookies.Add(cookie); 