The FTP Security Server is used to restrict people from uploading or downloading files as well as to virus scan all FTP file transfers. The FTP Security Server is enabled when the following situations are true.
There is a line that permits in.aftpd to start up in $FWDIR/conf/fwauthd.conf. This line is usually present by default.
A valid resource is defined in your security policy or in a User Authentication rule involving FTP.
The proper line for the FTP Security Server in $FWDIR/conf/fwauthd.conf looks like this (with no comment character, #, at the beginning of the line):
21 fwssd in.aftpd wait 0
If this line is not present or is commented out, the FTP Security Server will not run, and any process that relies on it ...