Bagaimana saya bisa memaksa keluar dari semua pengguna untuk situs web?

Seperti yang disarankan Joe, Anda dapat menulis HttpModule untuk membatalkan cookie yang ada sebelum DateTime tertentu. Jika Anda memasukkan ini ke dalam file konfigurasi, Anda dapat menambahkan/menghapusnya bila perlu. Misalnya,

Web.config:

<appSettings>
  <add key="forcedLogout" value="30-Mar-2011 5:00 pm" />
</appSettings>

<httpModules>
  <add name="LogoutModule" type="MyAssembly.Security.LogoutModule, MyAssembly"/>
</httpModules>

HttpModule di MyAssembly.dll:

public class LogoutModule: IHttpModule
{
    #region IHttpModule Members
    void IHttpModule.Dispose() { }
    void IHttpModule.Init(HttpApplication context)
    {
        context.AuthenticateRequest += new EventHandler(context_AuthenticateRequest);
    }
    #endregion


    /// <summary>
    /// Handle the authentication request and force logouts according to web.config
    /// </summary>
    /// <remarks>See "How To Implement IPrincipal" in MSDN</remarks>
    private void context_AuthenticateRequest(object sender, EventArgs e)
    {
        HttpApplication a = (HttpApplication)sender;
        HttpContext context = a.Context;

        // Extract the forms authentication cookie
        string cookieName = FormsAuthentication.FormsCookieName;
        HttpCookie authCookie = context.Request.Cookies[cookieName];
        DateTime? logoutTime = ConfigurationManager.AppSettings["forcedLogout"] as DateTime?;
        if (authCookie != null && logoutTime != null && authCookie.Expires < logoutTime.Value)
        {
            // Delete the auth cookie and let them start over.
            authCookie.Expires = DateTime.Now.AddDays(-1);
            context.Response.Cookies.Add(authCookie);
            context.Response.Redirect(FormsAuthentication.LoginUrl);
            context.Response.End();
        }
    }
}