Thanks for your answer. I've already checked the config file. Everything seems to be set correct. Passive port range is set to the specified range. Indeed, if masquerading is turned on, only encrypted connections use the specified range not passive connections without encryption. Perhaps a bug in proftpd.
Hi, I've problems using Masquerading and the passive FTP port range. System is the newest Version OMV 188.8.131.52, ProFTPD 1.3.4a Masquerading is set to on with an update intervall of 300s. Portrange is set to 192,0 till 192,50 (49152-49202) but FTP doesn't use this port range for passive connections. Using it in implicit TLS connections it works well and uses that range for file transfer. If I'm turning of masquerading it uses the right ports without encryption and everything works well except TLS…