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每隔一段时间，当有人登录到我的 ASP.Net MVC 4 应用程序时，他们就会返回到登录屏幕。重新输入凭据始终允许成功登录。日志记录确认两次尝试都输入了正确的凭据。

登录代码看起来像

[AllowAnonymous]
[HttpPost]
public ActionResult Login(LogOnModel model, string returnUrl)
{
    try
    {
        MyData md = (MyData)Session["MyData"]; // Should be null, but testing that it is after logging out and back in

        if (ModelState.IsValid)
        {
            if (Membership.ValidateUser(model.UserName, model.Password))
            {
                logger.Info("Successful login '" + model.UserName + "' from IP " + Request.IPAddresses());
                FormsAuthentication.SetAuthCookie(model.UserName, model.RememberMe);
                if (Url.IsLocalUrl(returnUrl) && returnUrl.Length > 1 && returnUrl.StartsWith("/")
                    && !returnUrl.StartsWith("//") && !returnUrl.StartsWith("/\\"))
                {
                    return Redirect(returnUrl);
                }
                else
                {
                    return RedirectToAction("Index", "Home");
                }
            }
            else
            {
                logger.Warn("Login failed '" + model.UserName + "' from IP " + Request.IPAddresses());
                ModelState.AddModelError("", "The user name or password provided is incorrect.");
            }
        }
        else
        {
            logger.Warn("Login failed (model state invalid) '" + model.UserName + "' from IP " + Request.IPAddresses());
            ModelState.AddModelError("", "The user name or password provided is incorrect.");
        }

        // If we got this far, something failed, redisplay form.
        logger.Warn("Something failed during login.  Redisplaying login form.");
    }
    catch (Exception ex)
    {
        logger.Warn("Exception during logon process: " + ex.Message);
    }

    return View(model);
}

变量logger是默认的 NLog 类记录器。

在隔离环境中重现问题后，日志文件立即看起来像

2012-08-22 10:51:25.4581 INFO 从 IP 10.0.0.21 成功登录“演示”

2012-08-22 10:51:39.9741 信息从 IP 10.0.0.21 成功登录“演示”

日志文件中不存在任何指示登录失败或异常的警告日志条目。

当 Web 服务器空闲一段时间后，这种情况似乎会更频繁地发生。

如何诊断/解决问题？

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