In recent Debian systems, the wireless configuration is delegated to a network-manager application by default, and the network-manager is a part of your desktop environment. It seems very comfortable for newbies, but an awful solution for an administrators who often use the console. I show you how you can manage your wifi networks using /etc/network/interfaces file.
What to do if you need to reboot a server remotely, and this server uses an encrypted root partition? By default, the boot process will stop, and wait for you to type the password on the console. I'll show you, how can you enter this password remotely over an ssh connection.