In passive mode, it is the client who initiates both control and data channel. The connection starts, initially, in plain text but once the SSL certificates are negotiated the connection is then encrypted. When trying to connect to an FTP server using TLS two options are available: explicit or implicit.Īn explicit connection in active mode will allow to connect to a FTP server using the regular port 21 for the control channel and the server will initiate a connection back to the client using port 20 as source. This article describes how to setup a policy to allow traffic to use FTP over TLS.
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