Do you have FTP logging enabled in your SYS1.TCPPARMS(FTPDATA)? I think 
this is done with:

FTPLOGGING  TRUE

This will produce some messages that are sent to the syslog daemon. That 
way, you can see every incoming FTP transaction that logs the date/time, 
foreign ip address, username, MVS dataset name, DCB attributes and bytes 
transferred.

You can even take this 1 step further by enabling trace by issuing the 
following 
command:

F FTPSERVE,DEBUG=(FLO,FSC(3),CMD)

This gives you even more detail info that is logged into the syslog daemon. 
The trick is to know where you syslog daemon is configured to store the 
syslog data. Look in /etc/syslog.conf and see what the *.debug is set to store 
the debug data.

Armed with this info, you can go back to your open systems people and work 
thru the log file and try to find where the contamination is occuring.

Bryan Klimek
Mayo Clinic

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