rn_enthusiast wrote:

You need to also forward the passive ports. It is not enough with just port 21.

Agreed, that is the problem here.

rn_enthusiast wrote:

I suggest you limit the passive ports to a range equal to the amount of users you expect at a time. So if you expect 10 concurrent users/sessions maximum then set the port range to, for example, 60000 - 60010.

I usually recommend 4 ports per simultaneous connection, partly because some clients can use more than one data connection at a time, and partly because if the session drops it can take a little time for the server to close it.

The recommended range for dynamic/private ports is 49152-65535 (and of course 60000-60010 is within this range).

Masquerading can also come into play with some FTP clients. FileZilla is one that doesn't need masquerading set. If your particular client does need it, you should set the masquerade in the NAS to be your router's ddns name. Note that usually will prevent you from using FTP to access your NAS on your local network.

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