flowbc.blogg.se - For mac filezilla

Unfortunately, some routers and firewalls block this port because hackers often target FTP servers via port 21. An FTP client cannot perform the protocol if it fails to connect to the FTP ports.

In order to work correctly, FTP must use two ports - port 21 for command and control, and port 20 for data transport.

BTW, dropbear is the particular SSH server that the UUT is using.

Now the here's the problem, when I setup the Telnet client, (configured with address "localhost", port 4200) all that happens is the SSH server sends back the string "SSH-2 0-dropbear_0.47" and there are no further transactions.

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An active open is done by the server, from its port 20 to the same port on the client machine as was used for the control connection. The FTP specification says that by default, all data transfers should be over a single connection. FTP uses the Telnet protocol on the control connection.