I am running vsftpd running on my Linux server. My vsftpd is configure under active mode to receive incoming connection. As a security issue it better to configure vsftpd server in passive mode. Now in passive mode firewall is also an issue. How can i configure my server under passive mode and open more number of ports on the firewall. I only want to configure some particular ports to the user to get access. Any used port can cause a security breach. Provide suggestions.
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