UltraVNC Viewer connection to Windows 2019 Server terminate the exiting RDP session

[ingridcao]

my Environment:
I have UltraVNC version 1.4.36 server installed on a Windows 2019 Server. It run s as a service.
I have UltraVNC version 1.4.36 viewer installed on a Windows 10 workstation.

My Questions:
1. I have RDP session to the 2019 server opened, and logged in as "abc". Run VNC viewer from workstation to connect to VNC server on the 2019 server, After typing in the VNC password, the windows login window appeared. Type in the windows login credential for account "abc", the VNC connection established, but it killed existing RDP session that was logged in with an account "abc". Is VNC connection using the RDP protocol? Has there been a setting in VNC server or VNC viewer to avoid using RDP, rather just clean the VNC server windows from the viewer. With the old version before, we can have the RDP session and VNC viewer session co-exist.
2. When run the VNC viewer, the windows login screen has a keyboard at the bottom. It blocks to switch users that is available to be used to login. Is there a way to make this keyboard disable/enable?

Thx
Ingrd

[rvk]

1. I have RDP session to the 2019 server opened, and logged in as "abc". Run VNC viewer from workstation to connect to VNC server on the 2019 server, After typing in the VNC password, the windows login window appeared. Type in the windows login credential for account "abc", the VNC connection established, but it killed existing RDP session that was logged in with an account "abc".

1. The UltraVNC server works just as a local screen (and does not use RDP protocol). When you connect to the 2019 server with RDP, the local user gets logged out and the session is run for the remote RDP connection. (With RDP only 1 session is normally allowed, unless specifically setup multiple in Windows server.)

If you then connect to the server with UltraVNC, you get the same as the local screen, so you get the login. That's normal. If you go to the server yourself, there is also a login screen. If you login on that screen, the RDP session gets logged out automatically.

With the old version before, we can have the RDP session and VNC viewer session co-exist.

Are you sure you didn't have a Terminal server then (it's called "Remote Destop Services" nowadays)? In that case you can open multiple sessions and the RDP session wouldn't be kicked out when you locally login (i.e. with UltraVNC). But the server needs to be setup specifically for that.
https://blog.oudel.com/how-do-i-allow-m ... rver-2019/

2. When run the VNC viewer, the windows login screen has a keyboard at the bottom. It blocks to switch users that is available to be used to login. Is there a way to make this keyboard disable/enable?

I'm not sure who displays that keyboard but it sounds like "Accessibility options" is on (i.e. Onscreen keyboard).
Can't you click that keyboard away with the X at the top-right of the keyboard?

Otherwise, do you have a screenshot of that screen?