I'm trying to figure out what StackExchange site would handle questions related to software ports, and their purpose?
Without seeing your actual question it's difficult to say for sure as there are likely more than one.
Why don't you just ask your question on Server Fault. If it's good and topical it'll get an answer. If it's good but not topical it'll likely get migrated to a place where it is topical. If it's a crappy question it'll get put on hold and eventually closed.