关于跨域登陆后再注销，再登陆确失败？应该是清除cookie有问题

[zwl12549]

登陆

FormsAuthenticationTicket authTicket = new
                FormsAuthenticationTicket(
                1, // version 
                username, // user name 
                DateTime.Now, // creation 
                rememberTime,// Expiration 
                false, // Persistent 
                userData); // User data 
            Session["username"] = username;//兼容之前登陆
            string encryptedTicket = FormsAuthentication.Encrypt(authTicket);

            HttpCookie authCookie = new HttpCookie(FormsAuthentication.FormsCookieName, encryptedTicket);
            authCookie.Expires = rememberTime;
            authCookie.Domain = "abc.com";
            //if (Response.Cookies[FormsAuthentication.FormsCookieName] == null)
            //    Response.Cookies.Add(authCookie);
            //else
            //    Response.Cookies.Set(authCookie);
            HttpContext.Current.Response.Cookies.Add(authCookie);

注销
[code=C#]
FormsAuthentication.SignOut();
HttpCookie cookie = new HttpCookie(FormsAuthentication.FormsCookieName, string.Empty);
cookie.Expires = DateTime.Now.AddMinutes(-1);
cookie.Path = FormsAuthentication.FormsCookiePath;
cookie.Domain = "abc.com";
Response.Cookies.Remove(FormsAuthentication.FormsCookieName);
Response.Cookies.Set(cookie);
Session.Abandon();
[code]


2个网站1.abc.com,2.abc.com登陆注销代码一样,放在同一台服务器同一个程序当中.
登陆后可以实现访问，但注销后偶尔会出来无法再登陆的情况，如果清除cookie再登陆确没问题

[nosuchtracter]

cookie存在和登录有关系吗？
在登录前先判断下cookie是否存在呢？

[Lovely_baby]

但注销后偶尔会出来无法再登陆的情况，如果清除cookie再登陆确没问题??
使用了cookies存值？
Response.Cookies["userAdmin"].Expires = DateTime.Now.AddDays(-1);//让cookie过期自动消除
Response.Write("<script language=javascript>window.parent.opener=null;top.location.href='login.aspx';</script>");//跳转到登陆页

这段代码放到按钮的单击事件中

[zwl12549]

我注销有代码：
cookie.Expires = DateTime.Now.AddMinutes(-1);
这里应该清除了吧？

[zwl12549]

再一个按道理就算没清除也会显示用户名吧？问题就是没显示用户名，
我读用户名是：return HttpContext.Current.User.Identity.Name;