DenyFilter [ DenyFilter regular-expression]
server config, <VirtualHost>, <Global>, <Anonymous>, <Directory>, .ftpaccess
1.2.0pre7 and later
Similar to AllowFilter, DenyFilter specifies a regular expression which must not match any of the command arguments. If the regex does match, a "Forbidden command" error is returned to the client. This can be especially useful for forbidding certain command argument combinations from ever reaching ProFTPD.
Notes: The 'PASV' command cannot be blocked using this directive.