https://forum.uvnc.com/viewtopic.php?p=112630&sid=5747e173c96382cfa09b054ed7b8bd87
UltraVNC Viewer connection to Windows 2019 Server terminate the exiting RDP session - UltraVNC
Aug 14, 2024 - ingridcao : Have you seen the rvk answer? Have you installed the latest UltraVNC build?
ultravnc viewerconnectionwindowsserverterminate