Keep-alive forms don't work as expected

[Blanca80]

Hello,

To see if the KeepAlive message is being sent navigate to a page where a session is active, press F12 if you're using Edge, then you'll see a split screen of the page and the Edge debugger.  Click Network, 'Preserve log', Fetch/XHR.  In my case I set the session timeout to 4 min.  Below you can see the IW KeepAlive message sends a ping every minute.  The last entry is a custom message I use in place of KeepAlive.

I think i've found the solution. We were using sessioncookies and for some reason after a short period of time ~15 minutes they change. Now, we don't use session cookies therefore the cookies persist and the user controls the session.