C# - How To Customize The Forms Authentication Cookie Name

Sep 2, 2010

I have 2 websites running on localhost in different ports. As browsers do not differentiate port numbers when sending cookies, my forms authentication ticket from one site is being sent to the other

How do I solve this? I thought that a good solution would be to change the forms authentication ticket or one of the websites but I don't know how to do this.

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We have a non-SSL ASP.NET web app that allows a user to login (ASP forms authentication, inproc).

Once authenticated, we redirect their browser to an external, SSL secured page on another web site / domain altogether that we do not control.

The client is redirected back to a pre-configured url on our original http web app when done.

However, the customer is then asked to "re-login" again on our side which is undesired...

It seems the forms authentication cookie is destroyed when transitioning between HTTP and HTTPS and back again.

How can I keep the forms authentication cookie alive so that the customer does not have to re-authenticate on the round trip?

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Security :: Forms Authentication Is Not Updating The Cookie?

Dec 13, 2010

We have had a bug recently where users are logging into an application with multiple browser tabs. They are editing a content page which means that they can be working on a page for sometime (ie with no postbacks) They finally click save and because the session has timed out it takes then to login page. I initally resolved they by adding a reminder that the session is about to expire which initally resolved the issue. It has been noted that even when they are within session time out they still got redirected to login page (and loosing the data on the form). We had real problems replicating the issue but have finally managed to do so now and I have learnt some curous features of .net Forms Authentication.

I have set up a test project which has the membership controls on etc. I have set the Timeout on the <forms> tag

<forms loginUrl="~/Account/Login.aspx" timeout="2" />Case 1I then open two browsers windows (side by side), both on the login page (and logged out)On the left window I login (and start a timer)after 40 seconds on the right window I navigate to a page (which takes me to the page as I have logged in on left window )I then wait until the full 2 minutes has elapsed (but before 2 Minutes and 40 seconds) and then try and navigate to a page on the left window.It redirects me to the login pageI would expect it to allow me to navigate to as I have kept my session open on the right window.Case 2I then open two browsers windows (side by side), both on the login page (and logged out)On the left window I login (and start a timer)after 90 seconds on the right window I navigate to a page (which takes me to the page as I have logged in on left window )I then wait until the full 2 minutes has elapsed (but before 2 Minutes and 40 seconds) and then try and navigate to a page on the left window.It Navigates to the page keeping me logged in.After a bit of reading around the subject I have found out that the slidingexpiration property only renews the cookie if it is in the last 50% of the timeout value:
Sliding expiration resets the expiration time for a valid authentication cookie if a request is made and more than half of the timeout interval has elapsed[URL]

My Question is: How can I override this bit of functionality?

Is there a property to set somewhere to "Always renew cookie"?

Is there another workaround. Unfortunately I can't increase the timeout because of a complience issue (it must be set to 15 minutes)

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AJAX :: PageMethods - Forms Authentication Cookie Not Always Sent?

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Since last week I've had a really odd issue with PageMethods, the forms authentication cookie, and the back button which i've never seen before.

Essentially, I have a 'home page' which on document.ready (using jQuery), loads some data through PageMethods, and then renders a list - from which you can click through to a details page about the item. In general use, it works fine. However, using the back button after clicking through (ie: going back to the home page), it throws a PageMethods error. The browser's 'authentication required' prompt appears, and if you click cancel, the server returns a 401. The error returned by PageMethods on the client side is 'authentication failed'.

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Sep 8, 2010

I am using Windows Integrated Authentication with impersonation for all my web applications (on IIS 7 and 7.5), and everything is perfect.

Now I would like to enhance the authentication procedures bypassing the login prompt from IIS, and supplying a custom page to collect the Username + Password inputs from Users, but still mantaining the Windows Authentication support (I rely on the WindowsPrincipal in my application for many core activities).

I just would like to replace the IIS popup with my custom authentication page.

First of all I have tried to mix the WIA with Forms Authentication, but - even if I succeed in authenticating users against the Active Directory - the result is not what I was looking for, because I want to mantain Windows Authentication and not migrating the mechanism to Forms Authentication (even if implemented with the AD provider).

The first step I am trying is to use the "LogonUser" function to create the correct WindowsPrincipal and then the "Impersonate" method, but after this step I have no idea about how to persist the authentication data andor to pass the User information to the Windows Authentication. As a result, when I execute the first redirection to another page the information about the user manually logged are lost.

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MVC :: Forms Authentication User.Identity.IsAuthenticated And Cookie?

Feb 9, 2010

I am using forms authentication and have an issue with a particular browser using the remember me feature. For various reasons I want to support the opera browser that works with the nintendo dsi. I can use forms authentication with that browser just fine but when I use the remember me (cookie) feature I can get through the login but then calls to User.Identity.IsAuthenticated return false. If I do not check remember me it works fine. Initially I thought the browser didn't support cookies but it does. At least I can go to m.gmail.com and check their version of remember me and it works. I can exit the browser and come back in and m.gmail.com remembers me. Also I don't have problems with remember me on any other browser I have tried.

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Jun 16, 2010

For some reason my users are logged out of the system every 10-15 minutes or so...regardless of the configuration below....am I missing something?


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Forms Authentication Cookie Not Expiring On Server Shutdown / Failure?

Jan 5, 2011

Here is a use case of my login using a CustomMembershipProvider

User Logs in MembershipProvider validates user account User property of Membership is set to user details coming from the database An authentication ticket is created Forms authentication cookie is added. User is logged in

Here is a use case of my problem Stop whe web development server Start the web development server, and user is still logged in (due to cookie?) User property Membership is set to null due to server restart/failure Application throws exception due to null user value

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Here is the code:


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Security :: Forms Authentication Cookie Not Changing Current User Identity

Jan 21, 2010

I am having a problem with security in a web application I am building using Visual Web Developer 2008. I am using Forms Authentication:

<authentication mode="Forms">
<forms name=".MYAUTH" timeout="20" enableCrossAppRedirects="true" />

And a SQL Server database with ASP.NET Membership and Roles. I am using the LoginView control with the AnonymousTemplate and LoggedInTemplate to manage the user's interaction with logging in and out. The problem I am having is that I am authenticating the user against the database:

If Membership.ValidateUser(_userName, _txtLoginPass.Text)
Then returns True and:
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{System.Web.Security.FormsAuthenticationTicket} CookiePath: "/"
Expiration: #1/21/2010 1:42:27 PM#
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IsPersistent: False
IssueDate: #1/21/2010 1:22:27 PM#
Name: "jaymo "
UserData: ""
Version: 2
but when I check
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IIS Configuration :: Membership Forms Authentication Cookie Clears On Application Pool Recycle

Jan 28, 2013

I use Form Based Authentication in my siteIn my login page I have:

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Jun 7, 2010

I am having a hard time implementing "Remember Me" functionality in an MVC application with a custom principal. I have boiled it down to ASP.NET not retrieving the authentication cookie for me. I have included a snaphot below from Google Chrome.

Shows the results of Request.Cookies that is set within the controller action and placed in ViewData for the view to read. Notice that it is missing the .ASPXAUTH cookie Shows the results from the Chrome developer tools. You can see that .ASPXAUTH is included here.

Does anyone know what the issue may be here? Why does ASP.NET not read this value from the cookie collection?

My application uses a custom IPrincipal. BusinessPrincipalBase is a CSLA object that ust implements IPrincipal. Here is the code for that:


I do not think that any of this is related because the bottom line is that the Request.Cookies does not return the authentication cookie. Is it related to the size of the cookie? I heard there are issues to the size of the cookie.

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Do we know the algorithm that asp.net uses to create the authentication cookie (when using forms authentication?)

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I have a bunch of applications that currently share the authentication cookie in v3.5.

We're in the process of upgrading to 4.0 and also upgrading the applications as a whole. I have 1 done, and would love to deploy it. However, as soon as I do, I lose my sharing of authentication cookie in that application.

In each web.config, my machine key is declared. I removed the actual keys to protect the innocent. :)

<machineKey validationKey="..." decryptionKey="..." validation="SHA1"/>
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ASPXAUTH Authentication Cookie Not Cleared On Sign/log Out

Dec 8, 2010

I'm using ASP authentication and the integrated webservice.

The user logins in with Forms authentication on a login page.

To log out, I call the authentication webservice from Silverlight and call logout.

Everything worked OK but now sometimes IE gets crazy and doesn't log out the user anymore.

I used Fiddler and it turns out that the authentication service returns a SetCookie to clear the ASPXAUTH cookie but on the next call IE still has the cookie set.

So off course because the cookie is there the user is authenticated and logs right back in rather than being directed to the login page.

I checked and didn't see any other description of the issue.

I can't reproduce it and my colleagues that have a misbehaving IE have it working fine on one environment and not on the other (one has the issue for DEV and another has the issue for the PreProd server).

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My users need to stay logged in for 1 day, so I used a persistent authentication cookie with an expiration of 1 day but it still times out after 20 minutes (which is the default timeout for the session, not the cookie).

This is my code:

<authentication mode="Forms">
<forms loginUrl="Login.aspx" protection="All" path="/" />
FormsAuthenticationTicket ticket =
new FormsAuthenticationTicket(1, "username", DateTime.Now, DateTime.Now.AddDays(1), true, "userdata");
string encTicket = FormsAuthentication.Encrypt(ticket);
HttpCookie cookie = new HttpCookie(FormsAuthentication.FormsCookieName, encTicket);
cookie.Expires = ticket.Expiration;

I also have manually-generated validation and decryption keys:


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I have 3 applications running at my end.


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Mar 5, 2011

I used this following code to set authenticate cookie :

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my question is how I can increase life-time for this authentication cookie ?

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Once the user has authenticated, I would like to base all of the information displayed to the user based on their username. Isn't that saved in the cookie?

For instance, I would like to pull all of their client information using a GridView and have the parameter set to the appropriate authentication information.

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My requirements is when one other website call my service (httphandler) and in response i will provide one parameter which is

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I am having a ASP.NET website, that also has WCF Authentication service. But I have just come know that even Java and PHP Application are also going to use my Authentication Gateway to authenticate user and so enable Single Sing-On.

I am done with the same in .NET application but to perform same in non-.NET techs, I need to decode FormsAuthentication Cookie of browser. FormsAuthentication Cookie are Encrypted so there must exist a algorithm that can decode it or a kind of dll that I can load in Java and read it.

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Dec 6, 2010

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What are the exact steps required for a cookie to persist after a browser is closed? At the moment I have:

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