Doteasy Knowledge Base: What is Active mode?

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What is Active mode?

Active mode is when the FTP server sets up the connection. The firewall on the clients side will see an outside connection trying to initiate with a computer internally and will generally not allow the connection. This is because the FTP server is controlling the connection and the FTP client's firewall is unable to correlate this connection with the initial connection. When this happens, we can try using passive mode instead.