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Why Does Active Ftp Not Work With Network Firewalls? |
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Answer» When a user initiates a connection with the FTP SERVER, two TCP connections are ESTABLISHED. The second TCP connection (FTP data connection) is initiated and established from the FTP server. When a firewall is between the FTP CLIENT and server, the firewall would BLOCK the connection initiated from the FTP server since it is a connection initiated from outside. To resolve this, Passive FTP can be used or the firewall rule can be modified to ADD the FTP server as trusted. When a user initiates a connection with the FTP server, two TCP connections are established. The second TCP connection (FTP data connection) is initiated and established from the FTP server. When a firewall is between the FTP client and server, the firewall would block the connection initiated from the FTP server since it is a connection initiated from outside. To resolve this, Passive FTP can be used or the firewall rule can be modified to add the FTP server as trusted. |
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