Hi, An strange, for me, situation... I can connect to my server using sftp. I can also connect using FTP in active mode, with a plain authentication (insecure, just for test). But I can not connect if I use passive mode, doesn't matter if using plain or TLS. I can also NOT connect using active mode and TLS authentication... Have you any idea about where could be the problem? My system is Debian 9 + ispconfig 3 + apache2 (perfect server guide). In an old system, using debian 7 + ispconfig3 I can connext FTP using TLS and default passive mode.