Jul 14, 2015
When you are running a session via our SSL over RDP, the X11 window will only allow one session at a time. By closing the X11 windows after a session ends you are then able to launch a session. Windows 8 to Windows 10 Remote Desktop Not Working Nov 12, 2015 remote access - Linux rdesktop ERROR recv Connection reset If you don't have control over the server you are trying to connect to (or having a bit of chicken/egg situation), then use FreeRDP which supports NLA. On Debian run sudo apt-get install xfreerdp-x11 How to Set Up an Ubuntu Remote Desktop - Lifewire Jul 21, 2020
How to Connect via Remote Desktop (RDP) to Ubuntu 20.04
Because of a security error, the client could not connect to the Terminal server. After making sure that you are logged on to the network, try connecting to the server again. Remote desktop disconnected. Because of a security error, the client could not connect to the remote computer. rdesktop: Remote Desktop Protocol client - Linux Man Pages (1)
General Remote Desktop connection troubleshooting
If you don't have control over the server you are trying to connect to (or having a bit of chicken/egg situation), then use FreeRDP which supports NLA. On Debian run sudo apt-get install xfreerdp-x11 How to Set Up an Ubuntu Remote Desktop - Lifewire