Passive means what during FTP?

From: case (case_at_c.com)
Date: 05/31/05 

Date: Tue, 31 May 2005 14:30:28 +0800

ftp> put client.conf
local: client.conf remote: client.conf
227 Entering Passive Mode (192,168,0,152,238,18)
ftp: connect: No route to host
ftp> passive
Passive mode off.
ftp> put client.conf
local: client.conf remote: client.conf
200 PORT command successful. Consider using PASV.
150 Ok to send data.
###
226 File receive OK.
3590 bytes sent in 0.0394 secs (89 Kbytes/sec)

Why file trasfer failed in Passive mode?

Thanks in advance

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