I followed your Pure-ftpd tutorial: Force Passive IP only for WAN but I'm stuck at the end: https://www.faqforge.com/linux/cont...ange-in-pure-ftpd-on-debian-and-ubuntu-linux/ Set Passive IP in PureFTPD Setting a passive IP in FTP might be necessary when your server is located behind a NAT router. You will get an error like "Error: Server returned unroutable private IP address in PASV reply" from your FTP client in such a case. To set a passive IP address, run this command: echo "188.8.131.52" > /etc/pure-ftpd/conf/ForcePassiveIP Replace 184.108.40.206 with the External IP address that clients shall use to connect to the FTP server. Then restart pureFTPD: When you talk about External IP address that clients should use to connect, what IP are you talking about? your server's IP? Please be a little clearer.