After upgrade OMV4 to OMV5 proftpd isn't working or more for a short time:
Jul 22 18:08:41 nas monit: 'proftpd' failed protocol test [FTP] at [localhost]:21 [TCP/IP] -- Connection timed outJul 22 18:08:42 nas systemd: proftpd.service: Found left-over process 10845 (proftpd) in control group while starting unit. Ignoring.Jul 22 18:08:42 nas systemd: This usually indicates unclean termination of a previous run, or service implementation deficiencies.Jul 22 18:08:42 nas proftpd: 192.168.178.10 - ProFTPD 1.3.6 (stable) (built Tue Mar 10 2020 23:03:08 UTC) standalone mode STARTUP
I can't find any issue. proftpd log is clean. After manual service stop, service starts again. FTP client connected short upload file and then disconnect.
Maybe this was the important thing: 'proftpd' failed protocol test [FTP] at [localhost]:21 [TCP/IP] -- Connection timed out