![]() ![]() ![]() ![]() May use a software firewall, requiring manual configuration to allow FTP server access.Ĭonfiguration 2: Router Connection to the Internet.Simplest setup, common with dial-up, DSL, cable modem, and broadband users.Configuration options for passive FTP mode can be found in the 'Advanced' section of the Server Manager.įailures during LIST, NLST, MLST, RETR, or STOR operations often trace back to data connection issues.Ĭonfiguration 1: Direct Internet Connection Administrators need to open the range of ports reserved for passive FTP connections in the firewall. Passive Mode FTP: This mode addresses firewall issues by having the client connect to the FTP server on a port communicated via the PASV command. It's essential to ensure port 20 on the machine running Cerberus FTP Server is open for outgoing connections. Two methods govern data connection establishment: active mode FTP and passive mode FTP.Īctive Mode FTP: In this mode, the client informs the FTP server of its IP address and the port it's listening on for data connections using the PORT command. If a software-based firewall is in use, it's crucial to confirm that incoming connections are not blocked on the chosen control connection port.ĭata Connection: The data connection, where file listings and transfers occur, often poses challenges for FTP server administrators. The default port for the control connection is 21, but Cerberus FTP Server can be configured to listen on any free port. It allows clients to connect, send commands, and receive server responses. FTP communication involves two connections - a control connection and a data connection, and special attention is needed to ensure their successful establishment.Ĭontrol Connection: The initial connection made with an FTP server is the control connection. SSH SFTP and HTTP/S operate differently.Ĭonnecting your FTP server to the internet for external access may require configuring your router or firewall, depending on your internet connection. Note: The following information specifically pertains to the FTP protocol. ![]() Setting Up External Access to Your Server - FTP Protocol ![]()
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