Ask Slashdot:System Crackers

endisnigh writes "I am a smalltime sysadmin working in a cyber cafe in Dublin - my problem is that the linux server that we have here (redhat 5.1) attracts system crackers for some reason - people from a few different countries who seem to be portscanning etc.. I wouldn't consider myself totally green as regards to linux, but find it hard to get good up-to-date linux security advice that covers everyting from shadow passwords, to secure finger daemons to immutable file systems to just *exactly* what daemons don't need to be running on a mail/web/name server. I want answers! I want advice! I want cheesy poofs! "