I have installed the Debian 3cx system and it works well. However, I have moved the Server, and NOT installed a Keyboard or Mouse or Monitor. This is my preferred configuration. Once I have turned it back on, and waited for a couple of minutes (enough for it to reboot), I cannot ping it. I put a screen on it, and a keyboard on it, and it boots up fine. Obviously I can ping it now, and 3cx works fine again. So my question is: How can I configure Debian to work headless (without the Monitor/Keyboard/Mouse) ? Thanks in advance.