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Badr Blog: vsFTPd Use PORT or PASV first.
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Active FTP vs Passive FTP: what are Active & Passive FTP modes, and their differences. - YouTube
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Solutions For The 425 Use Port Or Pasv First In Steps. - Techyv.com
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linux - Centos7 cannot connect to FTP server , 200 PORT command successful. Consider using PASV. 425 Failed to establish connection - Server Fault
FTP Active vs Passive modes
