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Beckhoff Information System - English
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Active vs Passive FTP Mode: Which One is More Secure? | securitywing
faq
File Transfer Protocol - FTP
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FTP active passive modes | World of Integration
firewall - What are the FTP ports? - Server Fault
Active vs. Passive FTP Simplified: Understanding FTP Ports | JSCAPE
21/tcp FTP - Enumeration | VK9 Security
FTP Active vs Passive modes
