Owners manual

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Connection: Enter the maximum number of allowed FTP connections for the NAS
and a single account and check "Enable FTP transfer limitation" to specify the
maximum upload and download rates.
Note: The maximum number of FTP connections varies based on the size of RAM
installed on the NAS:
If the NAS memory =< 1 GB, the maximum is 256.
If the NAS memory = 2 GB, the maximum is 512.
If the NAS memory >= 3 GB, the maximum is 1024.
Advanced
Passive FTP Port Range: You can use the default port range (55536-56559) or
specify a port range larger than 1023. When using this function, make sure you
have opened the ports on your router or firewall.
Respond with external IP address for passive FTP connection request: Enable
this function when a passive FTP connection is in use, the FTP server (NAS) is
behind a router, and a remote computer cannot connect to the FTP server over the
WAN. When this is enabled, the NAS replies with the specified IP address or
automatically detects an external IP address so that the remote computer is able to
connect to the FTP server.