How to sign out other user in ASP.NET Core Identity

Question

How can i sign out another user (not the currently logged one) in ASP.NET Core Identity.

I know there is a SignOutAsync() method in SignInManager, but t

Answer 1

First update the security stamp of that user:

await userManager.UpdateSecurityStampAsync(user)

Then that user won't be noticed the changes until the arrival of the SecurityStampValidationInterval. So set it to Zero for the immediate logout:

services.AddIdentity(identityOptions =>
{
   // enables immediate logout, after updating the user's stat.
   identityOptions.SecurityStampValidationInterval = TimeSpan.Zero;
}

Update: For ASP.NET Core Identity 2.x

services.Configure(options =>
{
    // enables immediate logout, after updating the user's stat.
    options.ValidationInterval = TimeSpan.Zero;   
});