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I'm trying to ftp a file, I can log in, /cd successfully but it's giving I/O error after I try to put the file.

This is the problem I see after migrating to Windows 7.

ftp> put rtmmast.csv
200 PORT command successful.
550 I/O Error: Socket Closed
ftp> bye
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FTP return code 550 is "Requested action not taken. File unavailable (e.g., file not found, no access)."

Ensure the FTP user account has write access to the folder/directory you are trying to put the file into (on the server).

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