Пропинговать удаленный адрес и порт Debian7

nmap -p 21 xxxxxxxxx

Starting Nmap 6.00 ( http://nmap.org ) at 2015-12-14 22:05 MSK
Nmap scan report for xxxxxxx
Host is up (0.043s latency).
PORT STATE SERVICE
21/tcp filtered ftp

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The code has been tested and works

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