FTP Configuration
Changes don't take effect until system restart.

FTP Server Port

The TCP/IP protocol has a number of ports which are used to differentiate requests to different processes. The standard FTP port number is 21. You can choose any port number from 1 to 65000, however, many port numbers on your system are reserved for other applications. The FTP-SSL server is currently not configurable (set to port 990.)
Maximum FTP Users

The maximum number of simultaneous FTP connections supported.
Maximum FTP Upload

The maximum size in bytes of any single FTP upload to the server. Set this value to 0 if there should be no maximum upload size.
Valid Characters

The list of characters that are valid for use in FTP file names. This affects both FTP upload and retrieval.