The network administrator has configured the enterprise firewall to permit port 21 to allow FTP transfers to occur from outside the enterprise. Users can connect to the FTP server that is located on the enterprise network. However, file transfers fails. Why could this be

The answer is "Port 20 must be authorised, along with Port 21."

Explanation:

It could be used to transfer data all machines on a computer, as only the title suggests. It can be used to exchange information across user accounts, transfer data to the server software records.

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