TCIP Ports

Try this Technet article on setting up FTP.
http://www.microsoft.com/technet/treeview/default.asp?url=/technet/prodtechnol/iis/maintain/optimize/custom.asp

Remove any embedded spaces from the URL.

You can find out the ports being used by typing netstat -a in a command line shell.

Don't forget, FTP usually uses TCP port 20 as a dynamic control port. You need to have that port open also if you want to send/receive files.
But yes, the RFC for FTP says that control port is 20, and the normal transfer port is TCP port 21. You can configure your FTP server to use different ports, if you want to hide your FTP server from an initial scan.
If you ever have questions on what ports your machine is listening on, you can always do a port scan against your machine. My favorite port scanner is the legendary NMAP.
www.insecure.org/nmap

hope this helps

FTP as defined by RFC 0765[Request for Comment {Internet definitions of protocols and policies }] File Transfer Protocol outlines what FTP is, what it's used for and what standard connector port[s] are associated with it. [here's a link to the REC]http://www.cis.ohio-state.edu/cs/Services/rfc/rfc-text/rfc0765.txt

For information on the 65000+ ports that are available and what they are used for, just type in Well Know Ports in your browsers search windows and click on one of the links. There is a ton of information available.

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