I updated my Knime version to 4.3.2 and my FTP workflow did not work on this version.
WARN FTP Connector 0:745 Failed to create 1-th FTP session (0 sessions already opened). Please consider decreasing the maximum FTP sessions.
ERROR FTP Connector 0:745 Failed to initialize FTP client pool
ERROR FTP Connector 0:745 Execute failed: Failed to connect with FTPS
So I reinstalled this last version and installed 4.3.1 and it works as it should…