if you download a file via the native FTP proxy the access.log will contain an entry like
192.168.0.1 Andre - [25/Jan/2012:12:14:04 +0100] "GET ftp://ftp.debian.org/debian/ls-lR.gz HTTP/1.1" 200 0 "" ""
Uploads should logged in a similar way.
There is no log that shows connection attempts, directory listings, etc.
thanks for quick reply.
I only connected and listed directories in my attempt. Thats why I did not see anything in logfile.
Now I did download a file and there is a corresponding line in "access.log".