FTP Active vs Passive modes
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File Transfer Protocol - FTP
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Active FTP vs. Passive FTP, a Definitive Explanation
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:max_bytes(150000):strip_icc()/GettyImages-182921537-5b3b9cd7c9e77c0054eaa689.jpg "TCP Port Number 21 and How It Works With FTP")
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Active FTP vs. Passive FTP, a Definitive Explanation
