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- What is the difference between active and passive FTP?
FTP connection mode (active or passive), determines how a data connection is established In both cases, a client creates a TCP control connection to an FTP server command port 21 This is a standard outgoing connection, as with any other file transfer protocol (SFTP, SCP, WebDAV) or any other TCP client application (e g web browser)
- Why is Passive FTP used more frequently? - Stack Overflow
The only reason to use passive ftp is that it works through any kind of firewall, as all connections are initiated by the client Active FTP has the server connecting BACK to the client to initiate data transfers, which dumb firewalls will disallow, as they have no way to know that the incoming connection is related to the FTP connection and
- Check if FTP server is passive or active using Telnet
Active Passive is controlled by the client, not the server When a client initiates a file transfer, it decides whether to perform an Active transfer (PORT or EPRT command) or a Passive transfer (PASV command), and as such the mode can be specified on a per-transfer basis FTP operates on port 21 by default, not on port 23
- Why doesnt SFTP have an active passive mode like FTP
Active passive mode distinction in FTP protocol is needed, because in FTP, there's a separate transfer channel connection for file transfers And in different network setups, a different mode might be needed (though nowadays, mostly passive mode it used) It's not useful where firewalls are concerned, it's a problem where firewalls are
- java - FTPClient - how to use active mode - Stack Overflow
I made a small application that should upload files to an FTP server The thing is that I used passive mode with the method enterLocalPassiveMode() Recently I was told that no passive mode is allowed on the FTP server, so I should make my application work in active mode I suppose it couldn't be done by simply changing the method to
- iis - Passive FTP instead of Active FTP - Stack Overflow
Passive vs Active ftp connection When active, it means that the server contacts the client, the client chooses a port that will be used to transfer data and then sends it back to the server to use Passive is used when people are behind a firewall for example and it means that the client doesn't choose a port but rather the server does that
- Use active mode FTP instead of passive mode during git-clone?
I have a GIT repository on a remote server that I want to access through FTP For some unfortunate reason the server only allows active mode FTP instead of passive mode i e If I use curl (same client used by git clone) to download a file directly, the following command works: curl -P - ftp: user:pass@server file
- FTP Server Ports in Active Mode and Passive Mode
In Active Mode, FTP will use a port to connect to the client port So in this mode, can the FTP use different local ports while initiating outgoing connections (which means FTP has different local ports for all data channels)? In Passive Mode, FTP will send back a port number through command channel to client then listen on this port number
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