Warning: FTP over TLS is not enabled, users cannot securely log in: You appear to be behind a NAT Router, please configure the passive mode settings and forward a range of ports
OpenWrt Wiki] AVM FRITZ!Box 4040
AVM Fritzbox as FTP Server | INSTAR Wiki 2.5 | INSTAR Deutschland GmbH
Fritzbox 6360 als FTP-Server für IP-Web-Cam einrichten scheitert ... | ComputerBase Forum
GitHub - chunkeey/FritzBox-4040-UBOOT: u-boot addon image for the AVM FritzBox 4040