As you all know, the default Identity provider provided in ASP.NET MVC has very strict password rules by default, such as requiring lowercase character, uppercase character, non-alphanumeric character and a number.
To config the password rules you need open IdentityConfig.cs and then configure the password rules that you want.
// Configure validation logic for passwords
manager.PasswordValidator = new PasswordValidator
{
RequiredLength = 3,
RequireNonLetterOrDigit = false,
RequireDigit = false,
RequireLowercase = false,
RequireUppercase = false
};
You can change login password length, digit, lowercase, upercase...