It can be any value, but should not collide with preexisting port number conventions, and should be less than 1024, so ordinary user processes cannot masquerade as ftpd. There is a potential problem here if 'ftpd' is run as a stand-alone daemon instead of by inetd. It is possible to run sftpd on a port other than 21, but in that case users would have to explicitly tell their clients which port to use, thereby reducing the likelihood of use. This should be the directory of which DSA is a subdirectory, and where randomSeed lives. Doing so disallows insecure connections.
Prod inetd to re-read inetd.conf.
You'll have to then cause inetd to re-read its configuration file. All messages are of the 'daemon' facility.