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FTP Connection Issue: How to Check If FTP Port 21 Is Not Blocked
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Detection rates for ports 21 (FTP), 23 (Telnet), 25 (SMTP) and 80... | Download Scientific Diagram
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5 Ways to Check if a Port Is Opened - wikiHow
Perintah-perintah Lengkap Telnet yang biasa digunakan di Linux dan Windows beserta contoh penggunaannya | E-Learning Computer Programming
windows - Can't acces to address ip with FTP port (21) by telnet - Stack Overflow
Best Windows 10 commands to diagnose your Internet connection
Understanding the FTP PORT command | TechTarget
Chapter 12. How to Connect Using Telnet
What is port 21 and 20 for FTP? - Quora
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Windows 測試TCP 連線，比Telnet 更好的方法-黑暗執行緒
