PasswordSignInAsync与MaxFailedAccessAttempts的关联及参数配置疑问

Hey there, let's break this down clearly because I can see where the confusion is coming from!

First: The Core Relationship #

MaxFailedAccessAttempts is the threshold (default 5) that defines how many consecutive failed login attempts are allowed before a user gets locked out. But this threshold only kicks in if you tell the sign-in process to actually track those failures and enforce the lockout—that's exactly what the lockoutOnFailure parameter controls.

Clearing Up Your Misunderstanding of lockoutOnFailure #

Your current take on this parameter is off, which is totally understandable! Let's fix that:

• When lockoutOnFailure = true: The system will increment the failed attempt counter every time the user enters wrong credentials. Once that counter hits MaxFailedAccessAttempts, the user gets locked out (for the duration set in DefaultLockoutTimeSpan, default 5 minutes). It does NOT lock them out on the first failure—only after hitting the threshold.
• When lockoutOnFailure = false: The system ignores failed attempts entirely. It won't increment the counter, so even if the user fails 100 times, they'll never hit the MaxFailedAccessAttempts threshold, and lockout will never trigger.

How to Get the Behavior You Want #

It sounds like you want the standard "lock after X failed attempts" flow. That means you do need to set lockoutOnFailure = true—that's what enables the system to track those failures and compare them against MaxFailedAccessAttempts.

If you want to customize the threshold or lockout duration, you can configure these in your Identity setup (usually in Program.cs or Startup.cs):

builder.Services.AddDefaultIdentity<IdentityUser>(options => options.SignIn.RequireConfirmedAccount = true)
    .AddEntityFrameworkStores<ApplicationDbContext>()
    .AddDefaultTokenProviders();

// Customize lockout settings
builder.Services.Configure<IdentityOptions>(options =>
{
    options.Lockout.MaxFailedAccessAttempts = 5; // Your desired threshold
    options.Lockout.DefaultLockoutTimeSpan = TimeSpan.FromMinutes(10); // How long the lockout lasts
    options.Lockout.AllowedForNewUsers = true; // Allow lockout for new users (default is true)
});

A Quick Recap of the Flow #

1. User tries to sign in with wrong credentials, lockoutOnFailure = true
2. System increments AccessFailedCount for the user
3. If AccessFailedCount < MaxFailedAccessAttempts: No lockout, user can try again
4. If AccessFailedCount == MaxFailedAccessAttempts: User is locked out for DefaultLockoutTimeSpan
5. When lockoutOnFailure = false: Steps 2-4 never happen—failed attempts don't get tracked

内容的提问来源于stack exchange，提问作者iSpain17