Question for the forum staff. Is the best place to submit bugs at https://github.com/revive-adserver/revive-adserver/issues? This forum has not been helpful with this issue. I'm not sure you can say it's definitely an AWS specific bug. I have proven PHP sessions work outside of Revive. The problem appears to be isolated to the software. It's highly possible a step was missed during the upgrade from OpenX to Revive but like Pierre and I have stated, multiple attempts show the issue is repeatable.