Security :: Prevent Multiple Concurrent User Logins For The Same UserName
Jun 2, 2010
My application is windows authenticated. The application pulls JUST the userName from the current windows account. Then I provide site access to this user depending on his account privileges. If his userName belongs to the admins list he is directed to admin screens. If his username belongs to users list he is directed to users screens. I handle this security in C# and some SQL tables(No membership provider and no Active directory security in the app).
I need to be able to prevent multiple concurrent logins for the same userName.
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Similar Messages:
Apr 8, 2010
how to prevent multiple user to be logged in at a time using a user id ?
I searched the internet and found some ways but somehow they do not work in these situations:
If javascript in brower is turned off.
If user do not click logout and directly close brower.
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Jul 17, 2015
I just want to detect who came to login into site and if same login already logged in ,if same login previously exits then we need to logout the previous session , how to do it using asp.net c#
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Jun 16, 2015
How to prevent multiple user to be logged in at a time using a user id ?
After login in to website, the same user id not login in any other system it gives alert msg User Alrdy Login.. and also i have another query If user do not click logout and directly close browser..
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Jan 22, 2010
I am working on site which requires to control user from its misusing. Say a user is login from 1 m/c the other user should not be able to login from other m/c with the same account, but user must be able to do multiple login of same user from the same m/c.
First I was hoping using the IP address check I will be able to do that but due to proxy many user will have a same IP address.
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Apr 8, 2010
Requirment is to stop more than one user to login at a time using same user id.I am storeing user id in session. I searched the internet and found some ways but somehow they do not work in these situations:If javascript in brower is turned off. If user do not click logout and directly close brower.
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Feb 11, 2011
I am trying to prevent multiple simultaneous logins in my web application. I want to signout all/any previous authentications of a user when they login. Such that the current login remains the only one.
How do I go about calling FormsAuthentication.SignOut() for a particular user to invalidate any existing authentications.I have tried searching everywhere but no answers, only theories.
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Jun 22, 2010
I want to prevent concurrent login under same username. I am using aspnet_users & membership concepts. So How can I achieve this....
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Feb 7, 2011
i have probleM to check the login ,but i found one solution in this site.. AVOID MULTIPLE USER LOGIN, ...IS THER ANY OTHER METHOD TO SOLVE THIS PROBLEM.....
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Feb 14, 2011
I have to allow only single user to access the site. We should not allow the same to user to access from another browser.
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Nov 2, 2010
I am using the provided ASP.NET SQL Membership & Role providers in my application.
How can I prevent that the same user does login from different workstations using the same credentials? I can imagine to use the IP address for this but I dont really know where to start from...
Also what about users behind the same router? Is there a way to prevent them access from different client PC's?
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Sep 8, 2010
What do you think about an ability of having multiple logins and login types to be attached to the same user? Let me explain this by showing how database schema can be re-factored to support this model:
Remove [Password], [PasswordSalt] columns from [Users] database tableAdd [Logins] table with one-to-many relationship between [Users] and [Logins] tables.This will allow one user to have multiple credentials attached to his or her account of different types such as Username&Password, Windows Live ID, Open ID from different providers
You will be able to restrict allowed login types and OpenID providers in web.config
So.. do you think it is a good idea to add support of this model into ASP.NET 4.5/5.0 membership service?
http://aspnet.codeplex.com/workitem/7149
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Aug 20, 2010
it possible to use an application event to save the username in a session variable? I would like to do something like this:
private void ContextOnBeginRequest(object sender, EventArgs eventArgs){
if (_context.Request.IsAuthenticated)
_context.Session["ID"] = _context.User.Identity.Name;
}
However in the above code I get an error saying that Session state is not available.
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Jan 27, 2010
how to prevent multiple login using vb.net? I'm using visual studio.net 2008
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Jun 19, 2010
I want to prevent multiple user login for same user in asp.net.. How can I achieve. Note: I want to control without database concepts
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Jan 14, 2010
I managed to user to perform multiple log on from other IE window session in my web application if the same log on is currently being used.Unfortunately I have problem to control multiple log on if the user is logging in using tab browsing in the same session. I know this is due to the same session Id but is there any way to trace down to the tab level within the same session?
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Jan 26, 2010
I am looking at how best to prevent a single user account logging on multiple times in a webforms application. I know that MembershipUser.IsOnline exists, but I've read a few forum and blog entries suggesting that this can be unreliable, particularly in scenarios where a user closes a browser (without logging out) and attempts to logon with a different machine or browser.
I looked at implementing a last past the post type system; when a user logs on older users are simply kicked off. It seems that FormsAuthentication.Signout() only works for the current user.
Am I missing a trick, is there a better way to prevent the same username logging on from multiple different locations?
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Apr 6, 2010
In my Aspnet_Users table I have 2 user with same UserName. Membership.DeleteUser method only can delete user by username. How can I delete user by userid?
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Jul 10, 2010
So its a ASP.NET problem where two users using the same machine, same browser:
User 1 logs in the domain.
User 1 changes some data without saving it.
User 2 logs in the domain in a separate tab.
User 1 switches back to his tab and saves the data.
User 1 actually saved the data into User 2!!
This is caused by the following mechanism:
Different tabs in the same browser seems to share the same session id.
We are storing user auth in cookie and the cookie is shared between tabs (same domain)
Therefore, when User 1 request to save, it is recognized as User 2 since the cookie has been updated to User 2.
So I'm wondering if there's any other methods to prevent this from happening, other than:
1. Use cookieless session so the session is embedded in uri.
2. Always include a hidden field in page to indicate which user owns the page.
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Nov 24, 2010
I'm using the "cache tecnique" to prevent multiple logins. Reading in this forum I have read the following code:
Global.asax
[Code]....
Login.aspx
[Code]...This code works fine, If the user is already logged the second login is not permitted. But....
But if I make the logout (destroing all my session variables) and I try to login a second time... it's not possible, I read that the user is already logged!!I have also tried to clear the cache after the logout but nothing changs, even if it is illogic because the code must work even if I don't do the log off...
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May 7, 2015
I want to implement Login session , in which one user can login from one device only ..and if on other device try to login with same ID the First Device get an Alert..
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Apr 26, 2010
Im using forms authentication and im trying to get the current username. I tried using Environment.UserName but I am getting "ASPNET". But if i change my application to windows authentication im getting the true username that is currently logged on. How can I get the true username that is currently logged on in the domain using the forms authentication.
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Mar 19, 2010
I want to capture when a user logs in and his username. I am using a login control inside a anonymous temp[late of a login view control. on the logedin event of the login I have this code:
Dim log As Login = CType(sender, Login)
If Not log.UserName = "bcweed@live.ca" Then
Dim mil As MailUtility = New MailUtility
mil.ClientLogin(log.UserName)
End If
but log.username is always empty and so is the page.user.identity.name and the page.user.identity.isauthenticated always returns false this even thouhgt this is the LogedIn event of the login and also I "just loged in" I really did.. is there a way to capture this is the global.asax?
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Mar 15, 2011
How do I retrieve the UserName for a logged in user? Membership.GetUser().UserName doesn't work for me - Object reference not set to an instance of an object.I need it to get the associated UserID which my own db tables use as primary keyFurthermore, as I am a rookie is the best approach to achieve this through LoggedIn as below?
[Code]...
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Feb 16, 2010
I have a problem with membership authentication. I have two websites, website1 and website2, and both of them uses forms authentication with SQL membership provider (SQLEXPRESS). I have two scenarios:
Case 1:don't publish the website1 and try to login website1 with user1 -->Works ok
don't publish the website2 and try to login --> it displays the previously logged in user (Website1 user)-->Perfect
Case 2:publish the website1 and login-->works ok
publish the website2 and try to login--> it does not show up the site1's logged in user (No idea why)
then login into website2 and open website1-->it does not show up the website2 logged in user or any user...It looks like something wrong with cookies....
my web.config looks like this:<authentication mode="Forms">
<forms loginUrl="~/LogOn/LogOn" timeout="2880" protection="All"/>
</authentication> [code]....
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