Security :: Log Off Current User When He Logs In From A Different Computer?
Sep 26, 2010
I want to log out the user when he (or someone else) logs in from a diferent computer using the same user name.
Basicaly i want to prevent multiple individuals from staying loged in under a single user name by signing out the previous users. Any ideeas about how i can acomplish that ?
i'm using ASP.NET membership for a silverlight application that makes use of Wcf Ria Services.
my problem is that i don't want multiple logins on the same account and i need to logout the user when he logs in on another machine. (I don't want the account to be used by many people at the same time, and the last who logs in must kick out everyone else)
This works fine - I have now added to the page a LoginStatus as when they arrive they are loggen in. The problem is when the user clicks the Logg off link I get the error on the page below -
Object reference not set to an instance of an object. Description: An unhandled exception occurred during the execution of the current web request. review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
[Code]....
Is this because the page load is trying to get the logged on user ID
but they have just logged out?
How can I allow the User to logg out without getting the error?
I've been trying to work out this error for a while now and i still dont understand it because i have been following a tutorial online step-by-step but i recieve this error when i log in ?
What i am trying to acheive is when the user logs in then they are able to view their 'profile' such as their name, address etc. The login is validated against a table in a database, ...this is the error i am recieving:
Description: An unhandled exception occurred during the execution of the current web request. review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
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I tried to use ClientScript. RegisterClientScriptBlock on Login1_Authenticate event, it didn't work. I tried the same thing on the Page_Load event of Default.aspx as well as Master Page load event, that also didnt work.
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Nowadays having activity logs of the system is needed for history and if someone who is trying to mess your site, it is easily to define who is it and when it happen. And even Facebook have it.
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(here is my Contact us page code, nothing special but I'll give you it just in case)