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FormsAuthentication.Encrypt returns null

There are several reason that the FormsAuthentication.Encrypt() returns null:

            FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(
                        1, // version
                        identity.Name, // Name
                        DateTime.Now, // issue date,
                        DateTime.Now.AddDays(1), // expiration date, created above
                        false, // persistent or not
                        jsSerializer.Serialize(identity) // User data
            );
             string encryptedTicket = FormsAuthentication.Encrypt(ticket);

  1. The Name property of the FormsAuthenticationTicket is null. 
  2. The UserData propery of the FormsAuthenticationTicket is null 
  3. The total length of the UserData is over 4K.

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