But when I autostart with vncserver I can’t connect via vncciewer. But when I autostart with automatic login and manualy start vncserver it works ok with vncviewer…
Could be the vnc viewer you are using doesn’t support the resolution or depth of the vnc server?
Try the following, will load vncserver with 640x480 after boot:
cat << _EOF_ > /DietPi/dietpi/.vncserver_settings 640 480 16 _EOF_ reboot
If that fails, please try using a desktop PC with realvnc viewer: https://www.realvnc.com/download/viewer/