Lucee 7 now has low level debugging options for FTP and SFTP
LUCEE_FTP_DEBUG=true
enables debug logging to the console for FTPLUCEE_JSCH_DEBUG=true
enables debug logging to the console for SFTP
https://luceeserver.atlassian.net/browse/LDEV-4318
thanks to @madmike_de for reminding me about this!