What is a passive FTP?
passive FTP is a connection between two servers where the client service is the initiator of the connection on both sides; Client and remote site. There are two types of file transmission protocols or FTP, active and passive. In FTP, a data port (usually port 20) and command or control port (usually number 21) are open between two computers, allowing you to move the files between the firewall units.
The client must follow two steps that are detailed below:
1) Open two non -forgotten local ports. The first port is n> 1023 and is set to access port 21 on the server using PASV FTP. The receiving server opens the port Port P> 1023 and the Port P Port is returned. It is now connected and data transfer between the client and the server can start. FTP serves Port 2 and N> 1023 from anywhere with an initiated client. Port 21 to port> 1023 and remote port> 1023 must be open for server to respond toclient requirements and sent data.
FTP passive configuration allows users to use your web browser as a FTP client. For this purpose, simply enter FTP: // URL in the address bar. Browsers generally do not support active FTP.
Passive FTP moves the load for problems and risks to the server side on the basis of the need to make highly numbered ports available for remote connection. FTP demons are used to manage the functions permitted on the ports.
Without passive FTP mode, a third -party application will have to use the connection, but this is done on the client's side.
Think of passive FTP as a shared storage cabinet. Anyone who has an address or web FTP and a key or ID, and a user ID and user password, has access to Locker, file transfer and data transfer at will. Active FTP would be a shared cabinet on the storage with a guard. You want to get access to DATům, you have to prove who you are and to ensure the firewall browsing permit or pass through the guard.
If you manage a passive FTP website, stay up to date in browser changes and available options. FTP third -party clients are free and widely available. If the access must be limited, changed the IP address for the FTP web and switch to FTP active mode.