problems with ftp without internet

Dear Friends,
I have the following problem, when there is no internet does not work the ftp to the server, with the local network
use a router for dhcp
SCO OpenServer 6.0
terminals with windows 7
ftp client ftplite
and also use ftp from ms-dos

to do?

regards

Make sure that the ftp server is running by starting telnet session at the console and trying

#ftp localhost

If this works then the ftp server is running. If not check /etc/services to see if it should be running. Any lines that are comments (start with a #) will not start.
If you want to use domain names instead of ip addresses, you will have to add them to the hosts files on the workstations, or create a local dns server.
Otherwise if 192.168.1.10 is the Unix system:

c:>ftp 192.168.1.10

Should work.