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What is the PASV mode (passive mode)?

April 26, 2017mode passive pasv

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What is the PASV mode (passive mode)?

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Usually, when retrieving files over FTP, two connections are used. One for commands and one for data. Command connection is set by the client and the data connection is set by server. In some cases (when using firewall for instance) both connections have to be set by the client. In such a cases the server goes to passive mode when a PASV command is sent from the client.