Sftp from UNIX to mainframe

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http://www.unix.com – Hi, I have many scripts where i have used sftp for file transfer from unix box to unix box.. Now that we have to sftp files from unix to mainframe, i would like to know if that is possible. I just tried in the same way i did from unix to unix, but i got the error as connection refused. Are there any commands with which i can check if we can sftp and what are the commands which we can use. Thanks in advance!! (HowTos)