virtualbox.org

I installed a Debian Web Server using VirtualBox. When I start the machine the console window opens up automatically. Since it is a server I usually do not need this window, the machine should just be running. Closing this window is also not possible without halting the server. Is there any solution to that? Thanks!

Yep. Set your VM to "headless", and turn on the RDP/VNC in the VM, also the RDP in Virtualbox, and you can remote into the VM anytime you need the console winodw. But you'll get no window when the VM starts.