Session is invalid null <br>The error occurred on line -1.

Thanks for your response,

The problem was the proxy (new rules),  the session was lost. We have to set the cookie path  in the cf instance configuration file

Hi,

The session is getting expired.

There will be a timefram which can be set in your coldfusion administrator settings page. May be you could change it; if you want

You probably get the error if your application attempts to apply the session scope after onSessionEnd has occurred. You have to pass the session scope as a parameter in onSessionEnd, then use that parameter instead.

I used to get this somewhat regularily (a couple times a week) on my previous CF8 32-bit server. I upgraded to a CF8 64-bit server and I have only seen it once in almost a year. My guess is something memory related, but this is totally a guess. You can google this and find several threads on this topic but I have not found any absolute causes or a fix.