FTP Protocol – Why Two Ports and Connections?

I’m finding that Stack Overflow and Server Fault fuel me with motivation to actually dig up answers to questions I’ve had but was too busy or could not easily find the answer to.

One of the questions I’ve had is why does the FTP protocol have an unconventional usage of two ports when other protocols are able to easily do all their business over one port and one connection.

“sims” on Server Fault also had the same question. I spent some time researching and found some info as to why:


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