The title just about says it all.

I'm not much used to configuring servers, but I like to work on complicated issues in Zen Cart using MAMP so I can experiment freely. In this case I'm fiddling with attributes to get better quotes out of the CP Sell OnLine server. So I need to ensure that MAMP is able to open port 30000, which is required by the CP software.

So if someone who's familiar with such things can lead me gently down that path, I would appreciate it.