Getting "Error occurred during a cryptographic operation"

As I hosted my application in plesk cloud server and everything is fine but if I sit screen ideally for 10 min then it will show the error

Error occurred during a cryptographic operation.

I did not understand why it is showing error, please help me.

Here is my global.ashx file code and controller code

protected void Application_PostAuthenticateRequest(Object sender, EventArgs e)
{
//HttpCookie authCookie = Context.Request.Cookies[FormsAuthentication.FormsCookieName];
HttpCookie authCookie = HttpContext.Current.Request.Cookies[FormsAuthentication.FormsCookieName];
if (authCookie != null)
{
FormsAuthenticationTicket authTicket = FormsAuthentication.Decrypt(authCookie.Value);
LoginUserViewModel serializeModel = JsonConvert.DeserializeObject(authTicket.UserData);
CustomPrincipal newUser = new CustomPrincipal(authTicket.Name);
newUser.Id = serializeModel.Id;
newUser.Email = serializeModel.Email;
//newUser.Password = serializeModel.Password;
newUser.FullName = serializeModel.FullName;
newUser.FirstName = serializeModel.FirstName;
newUser.LastName = serializeModel.LastName;
newUser.Roles = serializeModel.Roles;
HttpContext.Current.User = newUser;
}
}

namespace WebApp.Controllers
{
public class AccountController : Controller
{
// GET: Account
IUserRepository repo_user;
public AccountController(IUserRepository _repo_user)
{
repo_user = _repo_user;
}
public ActionResult Login()
{
return View();
}
public ActionResult UnAuthorize()
{
return View();
}
[HttpPost]
public ActionResult Login(LoginViewModel model)
{
if (ModelState.IsValid)
{
//UserViewModel user = repo_user.ValidateUser(model);
LoginUserViewModel user = repo_user.ValidateUser(model);
if (user != null)
{
string data = JsonConvert.SerializeObject(user);
FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(1, user.Email, DateTime.Now, DateTime.Now.AddMinutes(FormsAuthentication.Timeout.TotalMinutes), false, data, FormsAuthentication.FormsCookiePath);
string encTicket = FormsAuthentication.Encrypt(ticket);
HttpCookie cookie = new HttpCookie(FormsAuthentication.FormsCookieName, encTicket);
Response.Cookies.Add(cookie);
if (user.Roles.Contains("Admin"))
{
return RedirectToAction("Index", "Home", new { area = "Admin" });
}
else if (user.Roles.Contains("Company"))
{
return RedirectToAction("Index", "Home", new { area = "Company" });
}
else if (user.Roles.Contains("User"))
{
return RedirectToAction("Index", "Home", new { area = "User" });
}
else if (user.Roles.Contains("Franchisee"))
{
return RedirectToAction("Index", "Home", new { area = "Franchisee" });
}
}
else
{
TempData["UserLogin"] = " Userid or Password does not exist, please try with other credential";
}
}
return View();
}
public ActionResult SignOut()
{
FormsAuthentication.SignOut();
return RedirectToAction("Login");
}
}
}

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

Salman Beg6y ago
Yes Jefferson is right,you missed the machineKey in web.config file. please check that.
thanks.
0
Jefferson S. Motta6y ago
I already had this message:

for me was the MachineKey, look at: https://stackoverflow.com/questions/25857577/error-occurred-during-a-cryptographic-operation-when-decrypting-forms-cookie
0