Cisco Cisco HDT Network Storage Hard Drive Trays Administrator's Guide

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Managing the Shares
Configuring the NSS for FTP Access
Linksys Small Business NSS4000 and NSS6000 Series Network Storage System Administration Guide
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Select this option if the NSS is located behind a firewall and/or router. By default, 
the FTP server sets the NSS IP address to passive mode.
NOTE
Passive Mode FTP through a router and/or firewall only works on a single interface. 
If you have VLANs defined, you must choose which interface to access through FTP. 
To configure Passive Mode FTP, follow these steps:
STEP 1
From the Manager Menu, click Network 
   
Ports. 
The Network Port Configuration page appears.
STEP 2
Verify the FTP port number on the NSS (port number 21 is the default setting).
To use a non-default port number, enter the new port number in the FTP/FTPS 
Server Port
 field (For example: 8028) and then click Update. You must also 
specify this port number in your router configuration software.