Accessing Computer over Internet?

I'm wondering if its possible to access my computer from the internet when I'm not at home. I know if my computers on a local network one can access it, but is there a way to do a similar thing from the internet? I have my mac mini at home connected to a cable modem. I'm guessing if I can set it up as a type of web server it might be possible. Any ideas?

First, make it easy on yourself and sign up for a free DynDNS account so you don't have to remember your IP address (if it changes regularly)--there are other similar services, but I don't know what they are.
Second, set up your router to port forward the necessary ports (21 for FTP, 548 for afp, and 22 for SSH--more on that later).
Third, don't use regular FTP as it is not secure. Use SFTP and try Fugu.
If you want to make other connections to your home, learn how to, tunnel in via SSH and make all connections to your home computer secure. If you use this method, you can only open one odd, not popular port and pass all protocols through it via the SSH tunnel.
Fourth, make it even more secure by using Public/Private keys (noted in the previous article and explained a little more here).
There are various tunnel helpers out there. Search for Mac OS X SSH Tunnel and you should find lots of information.
Further, stocksys talks about editing the sshd_config file to change some other sshd controls to prevent unwanted visitors. Another article I found also suggested changing the listening ports for ssh so that you don't have to open the normal, well-know ssh port to the world.

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