Hello pevs, I would recommend that you submit issues such as this one to support@eggplant.io. One possibility is that another RDP session is highjacking your connection–typically only one RDP session at a time is possible on a SUT. Also, just because the connection is active doesn’t mean that it will keep the screen from locking. There does need to be interaction with the SUT display within the configured timeout setting in order to prevent the security screen lock from diplaying. You might turn off any energy-saving sleep settings in order to avoid that possibility. We hope this helps, but please follow up with us at the support email noted above if it does not help.