My question, is that possible to intall remotely Net-Firewall to our dedicated server over VNC?
Yes, you can install NeT Firewall rmotely using Remote Desktop or VNC.
Is your program will blocked my VNC traffic after restart the machine?
After installation NeT Firewall start in PASS ALL default mode and it won’t block VNC. You have to configure NeT Firewall after this and be carefull with setting rules and modes because one of the rules or modes may block VNC. I would recommend to create ALLOW rule for VNC traffic before creating any other rules.