How do I manually delete a cookie in asp.net MVC 4

Question

I need to delete authentication cookie manually (Instead of using FormsAuthentication.SignOut whcih for some reasons does not work). I tried

System.Web.HttpContext.Request.Cookies.Remove(cookieName); // for example .ASPXAUTH
System.Web.HttpContext.Response.Cookies.Remove(cookieName); // for example .ASPXAUTH
FormsAuthentication.SignOut(); // I don't know why this one does not work

Neither of those command work. In fact Response cookies are empty and request cookie contains the cookie I want to delete when the following commands are executed it no longer contains the cookie I deleted but in browser the cookie still exists and I am able to do things that authorized users can even after signing out.

Does this answer your question? How to remove all current domain cookies in MVC website? — David Buck
– David Buck, Commented Jul 3, 2020 at 21:35
"Calling the Remove method of the Cookies collection removes the cookie from the collection on the server side, so the cookie will not be sent to the client. However, the method does not remove the cookie from the client if it already exists there." Source — Asef Hossini
– Asef Hossini, Commented Aug 31, 2021 at 19:49

Asef Hossini · Accepted Answer · 2021-09-01 09:24:41Z

87

Try:

if (Request.Cookies["MyCookie"] != null)
{
    var c = new HttpCookie("MyCookie")
    {
        Expires = DateTime.Now.AddDays(-1)
    };
    Response.Cookies.Add(c);
}

More information on MSDN.

edited Sep 1, 2021 at 9:24

Asef Hossini

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answered Nov 26, 2013 at 14:00

Mateusz Rogulski

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1 Comment

Dimitri Over a year ago

I used to set the authentication cookie manually but the name was different than the forms authentication cookie name. after I changed it FormsAuthentication.SignOut() actually worked. thanks anyways

SomoKRoceS · Accepted Answer · 2020-07-04 04:52:34Z

7

c.Expires = DateTime.Now.AddDays(-1); This does not clear cookies instantly.

Use this: c.Expires = DateTime.Now.AddSeconds(1); This will clear cookies instantly.

edited Jul 4, 2020 at 4:52

SomoKRoceS

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answered Jul 3, 2020 at 21:08

JBash

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