Mac OSX is known to be one of the most secure default installations of any OS. Many people rely on that reputation solely when they use their Mac. But when you are considering to run a Mac as a server, always connected to the internet and always on, you should think twice. Luckily I saw several sources this week talking about a new guide from Corsaire. They have released a guide on Securing Mac OS X Tiger (long pdf) which addresses the new security features introduced through Tiger and presents some security good practice guidelines. Now it is possible to lock the OS down further, in order to securely connect to the internet.