You could try this. I have not tried this and make no guarantees...
Go to X:\Program Files\\McAfee\Content Security Reporter\reporter\conf and make a subdirectory called "resources" then a subdirectory under "resources" called "system" (so in the end you should have \McAfee\Content Security Reporter\reporter\conf\resources\system
Copy "X:\Program Files\McAfee\Content Security Reporter\reporter\conf\examples\resources\system \server.properties" to X:\Program Files\McAfee\Content Security Reporter\reporter\conf\resources\system
You could try commenting out the line FtpServerPort 9121 and restarting CSR to see if that resolves the issue.
(this assumes the install path is X:\Program Files\McAfee\Content Security Reporter\ for your installation)
*** update ***
The previous method didn't work, but when I set the port at 9112, it looks like it only allowed https connections, not FTP to come through on that port.
This might be worth testing out in your own environment
When I did this, 9121 didn't respond anymore, and 9112 only responded to HTTPS. Will that not suffice for "disabling" the function? As long as logs still flow after making the change and you can do a scan, it might be worth a try, no?