

On a Mac, make sure the firewall is turned off in System Preferences > Security & Privacy > Firewall. If this fixes the problem, consult your firewall's documentation or support to learn how to allow FTP connections with the firewall turned on.

The first thing we recommend is turning off any firewall software as a test. Turning on passive mode almost always fixes FTP connection problems. (Look for the words passive or PASV in the settings the checkbox is often labeled "PASV FTP" or something similar.) Consult the documentation for your FTP program if you're unsure how to do it. If you use a different FTP program, it almost certainly has a checkbox to turn on "passive mode" in either the connection setup screen or the program preferences screen. To solve these kinds of connection problems, turn on passive FTP transfer mode in your FTP program:

