During today's maintenance, CDSSSH (Remote Login Machine for CDS) was successfully upgraded from Debian 8 (Jessie) to Debian 9 (Stretch) without incident, after the upgrade process, I tested the connection and logged into CDS successfully. Also as part of the maintenance I updated and rebooted EPICS-GW which provides internal epics channel connectivity to the Control Room, During the reboot not interference with the Control Room activities was reported or seen. Also all Workstation and main servers where updated as well. 
Since the Control Room is now in 24 hours operation setting zotws3 (the main operator workstations) was removed from the scheduled reboot list. Please operators be advice that if reboot is required for kernel or other major updates, manually rebooting ZOTWS3 will be requested as possible.