I have an iframe keep alive (an iframe that goes to the page, defibrillator.aspx, on my site every few minutes to keep the session alive) on my main page for an asp.net application. This works most of the time, but each time my session variables return null while loading a page on my defibrillator page. At first, I thought the session was disconnected by the server for some reason, so I put some records in the Session_End event in global.asax, but it never got there.
Any ideas that could lead to a session loss.
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