Port Forwarding Error 31526?

[tyoma_first]

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.