vncviewer.exe -autoscaling -autoreconect 30 -connect %Computer%::5900 -quickoption 3 -dsmplugin SecureVNCPlugin64.dsm
It works fine for me and returns the windows

Register with User and Password and the connection is succesful.
I'm looking for command parms vor the vncviewer.exe to automate this looking. But it doesn't exist. For Example:
vncviewer.exe -autoscaling -autoreconect 30 -connect %Computer%::5900 -quickoption 3 -dsmplugin SecureVNCPlugin64.dsm -msuser loginuser -mpass mypass
thanks a lot
Markus