Something like (you may change the inbound port, but the FTP client will need to use the port when connecting):
Description NASFTP1
Inbound port 20
Type TCP
Private IP address 192.168.2.25
Private port 20
Description NASFTP2
Inbound port 21
Type TCP
Private IP address 192.168.2.25
Private port 21
Hope this help.
Note: You may need to use any Dynamic DNS (like DynDNS, No-IP) to associate to your Public IP.
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I’m also having this issue (error 31526), and also did port forwarding from 20 to 20 and 21 to 21 and still unable to connect via FTP (using my external IP).
Here is my port forwarding config:
External Port
Internal Port
Protocol
To IP Address
Enabled
20
20
Both
192.168.1.100
21
21
Both
192.168.1.100
And here is a record from DHCP “already reserved clients” table to be sure that I’m forwarding to a correct IP
Client Name
Assign IP Address
To This MAC Address
MAC Address
MyBookLive
192.168.1.100
Anything else you may suggest? Any other info you need to troubleshoot?
I figured this out for me. The main problem was that I was trying to enable FTP not where it should be enabled. After I checked “Allow FTP” @ Settings → Network → FTP - it worked for me. There is one thing you should pay attention to: first check if FTP working using your local IP (192.168…) - in my case I was unable to connect to the drive through FTP using my actual IP from my network, but had no any issues connecting from outside of my network, e.g. from Android Phone on data, not on WiFi.
