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Go ftp server windows firewall9/3/2023 ![]() Another significant problem is that you must give new inbound connections (non-ACK packets) access to the internal network. How do you handle PORT-mode requests made from your FTP clients? You need to allow both inbound and outbound connections to support PORT-mode FTP client requests made from behind your firewall:Īs you can see, packet filters required to support PORT-mode FTP clients don’t lead to a very secure firewall/router configuration simply because such a wide range of ports is left standing open to the masses. The FTP server never needs to create a new connection back to the FTP client.įTP modes pose distinct security challenges, depending on whether you’re the client-side or the server-side firewall administrator. Note that the PASV-mode FTP client initiates all connections. Data transfer takes place through this channel.
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