21/tcp FTP - Enumeration | VK9 Security
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Open ftp port 21 on windows XP operating system - nixCraft
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Active vs. Passive FTP Simplified: Understanding FTP Ports
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A tutorial on how-to set up the File Transfer Protocol (FTP) server using IIS on Windows 2000 server platform
What Is Ftp Port Number and How Ftp Port Used? – POFTUT
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Opening custom port for a Passive mode FTP Server | SonicWall
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Using a single port for IIS FTP in passive mode
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What are the FTP ports? - Server Fault
Active vs. Passive FTP Simplified: Understanding FTP Ports
FTP (File Transfer Protocol) Port Numbers – WiseTut
