How can I make service XYZ more secure in Debian?
You will find information in this document to make some services (FTP, Bind) more secure in Debian GNU/Linux. For services not covered here, however, check the program’s documentation, or general Linux information. Most of the security guidelines for Unix systems apply also to Debian so securing service X in Debian is, most of the time, like securing the service for any other Linux distribution (or Unix, for that matter).