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I need to intercept a web forms timeout event to trigger my own code.
How to do this?

What I have tried:

I have a website using Forms Authentication for user logins.
This is all working nicely but I want to include the ability to reject a logon if a user is already logged in. ie reject concurrent logons from 2 PC's.

To do this I have appended a 'LoggedIn' column to the SQL aspnet_Users table.
The asp:Login's 'LoginUser_LoggedIn' event writes a 1 to the LoggedIn column and further login attempts check this value before allowing access.

When the user logs off, the asp:LoginView's 'HeadLoginStatus_LoggedOut' event writes a 0 to the table to reverse the login.

As I said this is all working fine.

The problem I have is that when the forms automatic timeout is triggered, obviously the table is not updated to reflect the logout. I need to intercept the forms timeout event so as to update the users table.

Here's the Forms code from the web.config file
<authentication mode="Forms">      
      <forms name=".ASPXAUTH" loginUrl="~/Account/Login.aspx" protection="All" timeout="240" path="/" requireSSL="false" slidingExpiration="true" defaultUrl="Default.aspx" cookieless="UseDeviceProfile" enableCrossAppRedirects="false" />
Updated 12-Nov-19 23:12pm

What you want to do is to utilize the Session End event to update our SQL table

Session_Start and Session_End | The ASP.NET Forums[^]
Member 11709930 12-Nov-19 18:40pm
Thanks but I'm after the Forms Timeout which logs off the user.
Session timeout is somewhat different.
MadMyche 13-Nov-19 7:57am
I understand that; the only problem is there really is no documentation for a "Forms Timeout Event".
What you can do is utilize the SessionID along with the Token to set/reset your LoggedIn status.

Most likely you will need to do this within an HttpModule, which has events for AuthenticateRequest and AuthorizeRequest; and if the SessionID-Token pair is "broken" then you kill the login.

IF I have some spare time today, I will see if I can find some info or code... just consider this a starting point
Member 11709930 13-Nov-19 15:01pm
Appreciate your help MadMyche as I'm way out of my experience depth with this.
Member 11709930 13-Nov-19 14:35pm
I agree with that up to a point.
In my case, I am restricting users so as to avoid having to buy a large number of SQL CAL's.
F-ES Sitecore 14-Nov-19 4:39am
In a web server there is only one thing accessing SQL and that is the web server, no matter how many users you have. I don't know a lot about licensing but it seems to me your actual issue is getting the right\appropriate license. I believe there are web specific licenses for SQL Server. In addition to all of that, being logged in or not does not define access. You're still a "client" if you are not logged in.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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