# asp.net – FormsAuthentication.SignOut() does not log the user out

## The Question :

146 people think this question is useful

Smashed my head against this a bit too long. How do I prevent a user from browsing a site’s pages after they have been logged out using FormsAuthentication.SignOut? I would expect this to do it:

FormsAuthentication.SignOut();
Session.Abandon();



But it doesn’t. If I type in a URL directly, I can still browse to the page. I haven’t used roll-your-own security in a while so I forget why this doesn’t work.

• That code is fine as is … clicking back in the browser does not revisit the page on the server it simply reloads the local cached version of the page. All of the solutions below seem to ignore that fact and not actually do anything more than you are doing here. In short … there is no answer to this question that will solve the user looking at their cache as to date I don’t believe there is a way to clear cache in say … js or with a server side instruction.
• This answer offers some ways to check, especially if you’re site is failing PEN tests: stackoverflow.com/questions/31565632/…

213 people think this answer is useful

Users can still browse your website because cookies are not cleared when you call FormsAuthentication.SignOut() and they are authenticated on every new request. In MS documentation is says that cookie will be cleared but they don’t, bug? Its exactly the same with Session.Abandon(), cookie is still there.

You should change your code to this:

FormsAuthentication.SignOut();
Session.Abandon();

// clear session cookie (not necessary for your current problem but i would recommend you do it anyway)
SessionStateSection sessionStateSection = (SessionStateSection)WebConfigurationManager.GetSection("system.web/sessionState");



HttpCookie is in the System.Web namespace. MSDN Reference.

22 people think this answer is useful

Using two of the above postings by x64igor and Phil Haselden solved this:

1. x64igor gave the example to do the Logout:

• You first need to Clear the Authentication Cookie and Session Cookie by passing back empty cookies in the Response to the Logout.

public ActionResult LogOff()
{
FormsAuthentication.SignOut();
Session.Clear();  // This may not be needed -- but can't hurt
Session.Abandon();



2. Phil Haselden gave the example above of how to prevent caching after logout:

• You need to Invalidate the Cache on the Client Side via the Response.

    // Invalidate the Cache on the Client Side
Response.Cache.SetCacheability( HttpCacheability.NoCache );
Response.Cache.SetNoStore();

// Redirect to the Home Page (that should be intercepted and redirected to the Login Page first)
return RedirectToAction( "Index", "Home" );
}



20 people think this answer is useful

Sounds to me like you don’t have your web.config authorization section set up properly within . See below for an example.

<authentication mode="Forms">
</authentication>
<authorization>
<deny users="?" />
</authorization>



12 people think this answer is useful

The key here is that you say “If I type in a URL directly…”.

By default under forms authentication the browser caches pages for the user. So, selecting a URL directly from the browsers address box dropdown, or typing it in, MAY get the page from the browser’s cache, and never go back to the server to check authentication/authorization. The solution to this is to prevent client-side caching in the Page_Load event of each page, or in the OnLoad() of your base page:

Response.Cache.SetCacheability(HttpCacheability.NoCache);



You might also like to call:

Response.Cache.SetNoStore();



11 people think this answer is useful

I’ve struggled with this before too.

Here’s an analogy for what seems to be going on… A new visitor, Joe, comes to the site and logs in via the login page using FormsAuthentication. ASP.NET generates a new identity for Joe, and gives him a cookie. That cookie is like the key to the house, and as long as Joe returns with that key, he can open the lock. Each visitor is given a new key and a new lock to use.

When FormsAuthentication.SignOut() is called, the system tells Joe to lose the key. Normally, this works, since Joe no longer has the key, he cannot get in.

However, if Joe ever comes back, and does have that lost key, he is let back in!

From what I can tell, there is no way to tell ASP.NET to change the lock on the door!

The way I can live with this is to remember Joe’s name in a Session variable. When he logs out, I abandon the Session so I don’t have his name anymore. Later, to check if he is allowed in, I simply compare his Identity.Name to what the current session has, and if they don’t match, he is not a valid visitor.

In short, for a web site, do NOT rely on User.Identity.IsAuthenticated without also checking your Session variables!

7 people think this answer is useful

After lots of search finally this worked for me . I hope it helps.

public ActionResult LogOff()
{
AuthenticationManager.SignOut();
HttpContext.User = new GenericPrincipal(new GenericIdentity(string.Empty), null);
return RedirectToAction("Index", "Home");
}



6 people think this answer is useful

This works for me

public virtual ActionResult LogOff()
{
FormsAuthentication.SignOut();
{
}
{
}
return RedirectToAction(MVC.Home.Index());
}



5 people think this answer is useful

# This Answer is technically identical to Khosro.Pakmanesh. I’m posting it to clarify how his answer differs from other answers on this thread, and in which use case it can be used.

In general to clear a user-session, doing

HttpContext.Session.Abandon();
FormsAuthentication.SignOut();



will effectively log out the user. However, if in the same Request you need to check Request.isAuthenticated (as may often happen in an Authorization Filter, for example), then you will find that

Request.isAuthenticated == true



even _after you did HttpContext.Session.Abandon() and FormsAuthentication.SignOut().

The only thing that worked was doing

AuthenticationManager.SignOut();
HttpContext.User = new GenericPrincipal(new GenericIdentity(string.Empty), null);



That effectively sets Request.isAuthenticated = false.

3 people think this answer is useful

The code you posted looks like it should correctly remove the forms authentication token, so it is possible that the folders/pages in question are not actually protected.

Have you confirmed that the pages cannot be accessed before a login has occured?

Can you post the web.config settings and login code that you are using?

3 people think this answer is useful

I have been writing a base class for all of my Pages and I came to the same issue. I had code like the following and It didn’t work. By tracing, control passes from RedirectToLoginPage() statement to the next line without to be redirected.

if (_requiresAuthentication)
{
if (!User.Identity.IsAuthenticated)

// check authorization for restricted pages only
if (_isRestrictedPage) AuthorizePageAndButtons();
}



I found out that there are two solutions. Either to modify FormsAuthentication.RedirectToLoginPage(); to be

if (!User.Identity.IsAuthenticated)



OR to modify the web.config by adding

<authorization>
<deny users="?" />
</authorization>



In the second case, while tracing, control didn’t reach the requested page. It has been redirected immediately to the login url before hitting the break point. Hence, The SignOut() method isn’t the issue, the redirect method is the one.

I hope that may help someone

Regards

3 people think this answer is useful

I just tried some of the suggestions here and while I was able to use the browser back button, when I clicked on a menu selection the [Authorize] token for that [ActionResult] sent me right back to the login screen.

Here is my logout code:

        FormsAuthentication.SignOut();
{
}



Although the back function on the browser took me back and displayed the secured menu (I am still working on that) I was not able to do anything that was secured in the app.

Hope this helps

3 people think this answer is useful

I’ve tried most answers in this thread, no luck. Ended up with this:

protected void btnLogout_Click(object sender, EventArgs e)
{
FormsAuthentication.Initialize();
}



Found it here: http://forums.asp.net/t/1306526.aspx/1

2 people think this answer is useful

This started happening to me when I set the authentication > forms > Path property in Web.config. Removing that fixed the problem, and a simple FormsAuthentication.SignOut(); again removed the cookie.

1 people think this answer is useful

It could be that you are logging in from one subdomain (sub1.domain.com) and then trying to logout from a different subdomain (www.domain.com).

1 people think this answer is useful

I just had the same problem, where SignOut() seemingly failed to properly remove the ticket. But only in a specific case, where some other logic caused a redirect. After I removed this second redirect (replaced it with an error message), the problem went away.

The problem must have been that the page redirected at the wrong time, hence not triggering authentication.

1 people think this answer is useful

I am having a similar issue now and I believe the problem in my case as well as the original poster is because of the redirect. By default a Response.Redirect causes an exception which immediately bubbles up until it is caught and the redirect is immediately executed, I am guessing that this is preventing the modified cookie collection from being passed down to the client. If you modify your code to use:

Response.Redirect("url", false);



This prevents the exception and seems to allow the cookie to be properly sent back to the client.

1 people think this answer is useful

Just try to send a session variable when you press log in. And on the welcome page, first check whether that session is empty like this in the page load or in the Init Event:

if(Session["UserID"] == null || Session["UserID"] == "")
{
}



1 people think this answer is useful

I wanted to add some information to help understand the problem. Forms Authentication allows for storing user data either in a cookie, or in the query string of the URL. The method your site supports can be configured in the web.config file.

The SignOut method removes the forms-authentication ticket information from the cookie or the URL if CookiesSupported is false.

At the same time, they say:

One of the HttpCookieMode values that indicates whether the application is configured for cookieless forms authentication. The default is UseDeviceProfile.

Lastly, regarding UseDeviceProfile, they say:

If the CookieMode property is set to UseDeviceProfile, the CookiesSupported property will return true if the Browser for the current Request supports both cookies and redirecting with cookies; otherwise, the CookiesSupported property will return false.

Piecing this all together, depending on the user’s browser, the default configuration may result in CookiesSupported being true, which means the SignOut method doesn’t clear the ticket from the cookie. This seems counter-intuitive and I don’t know why it works this way — I would expect SignOut to actually sign the user out under any circumstances.

One way to make the SignOut work by itself is to change the cookie mode to “UseCookies” (i.e. cookies are required) in the web.config file:

<authentication mode="Forms">
</authentication>



According to my tests, doing this makes SignOut work by itself at the cost of your site now requiring cookies to function properly.

1 people think this answer is useful

For me, the following approach works. I think if there is any error after the “FormsAuthentication.SignOut()” statement, SingOut doesn’t work.

public ActionResult SignOut()
{
if (Request.IsAuthenticated)
{
FormsAuthentication.SignOut();

return Redirect("~/");
}
return View();
}



0 people think this answer is useful

Are you testing/seeing this behaviour using IE? It’s possible that IE is serving up those pages from the cache. It is notoriously hard to get IE to flush it’s cache, and so on many occasions, even after you log out, typing the url of one of the “secured” pages would show the cached content from before.

(I’ve seen this behaviour even when you log as a different user, and IE shows the “Welcome ” bar at the top of your page, with the old user’s username. Nowadays, usually a reload will update it, but if it’s persistant, it could still be a caching issue.)

0 people think this answer is useful

Doing Session.abandon() and destroying the cookie works pretty good. I’m using mvc3 and it looks like the problem occurs if you go to a protected page, log out, and go via your browser history. Not a big deal but still kinda of annoying.

Trying to go through links on my web app works the right way though.

Setting it to not do browser caching may be the way to go.

0 people think this answer is useful

For MVC this works for me:

        public ActionResult LogOff()
{
FormsAuthentication.SignOut();
return Redirect(FormsAuthentication.GetRedirectUrl(User.Identity.Name, true));
}