File Transfer Protocol - FTP
The TCP/IP Guide - FTP Data Connection Management, Normal (Active) and Passive Data Connections and Port Usage
Which ports should be opened for FTP access? - Microsoft Q&A
What is FTP server and how does it work?
FTP Port: File Transfer and Port Numbers | ExaVault Blog
FTP Optimization
Is Port 21 Secure? Fully Explained | ExaVault Blog
FTP and FTPS ports: an overview | Cerberus FTP Server
FTP Active vs Passive modes
FTP port forwarding on TransPort routers | Digi International
IP/Network | ShareTechnote
Active vs. Passive FTP Simplified: Understanding FTP Ports | JSCAPE
Beckhoff Information System - English
FTP Active vs Passive modes
Active FTP vs. Passive FTP, a Definitive Explanation
Active vs Passive FTP Mode: Which One is More Secure? | securitywing
Active FTP vs. Passive FTP, a Definitive Explanation
What is port 21 and 20 for FTP? - Quora
FTP Ports | What is FTP? | FTP Modes | FTP Commands ⋆ IpCisco
Understanding the FTP PORT command | TechTarget
21/tcp FTP - Enumeration | VK9 Security
What Is Ftp Port Number and How Ftp Port Used? – POFTUT
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