ftp: ftp/tcp: unknown service
To transfer files to or from a remote computer using the Ftp command, the computer must have Ftp server running. It does not.
If you can transfer the files to a different computer, try using it. Similarly, if the files you are getting from the remote computer reside on a different computer, try using it. Otherwise, you will have to contact someone at the remote computer, or your network administrator, to get the Ftp server running on your computer.