Port Number
As the FSP protocol is not officially recognized by IANA, it has no official port number. However, as a UDP equivalent of FTP, official FSP servers frequently run on UDP port 21, which is the same as FTP's TCP port number. Because FSP uses UDP and FTP uses TCP they can both run at same time on the same port number without conflict. Unofficial servers may run on any port, although 2121 was a popular choice. (On most *nix systems, only the root user can start a process that listens on a port under 1024.)
Read more about this topic: File Service Protocol
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