How to Enable Passive Mode

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This article shows how to enable FTP (File Transfer Protocol) passive mode for server with pure-ftpd and APF (Advanced Policy Firewall) installed. Pure-ftpd installation will disable the passive mode and even if you have enabled it, you still have to open some ports of your APF.

Pure-Ftpd Configuration

  • Login to your server with root access
  • Edit the pure-ftpd configuration by typing: pico -w /etc/pure-ftpd.conf
  • Look for line: #PassivePortRange 30000 50000
    Note that the port range may different in your configuration.
  • Enable the Passive Port Range by deleting the # mark. The line will become: PassivePortRange 30000 50000
  • Restart the pure-ftpd service with command: service pure-ftpd restart

At this state you have just enabling the Passive Mode of your pure-ftpd.

APF Configuration

Next step is to open the passive mode’s port range in your APF.

  • Open the APF configuration, pico -w /etc/apf/conf.apf
  • Look for line: #Common ingress (inbound) TCP ports
  • Just below that line, add specified port range with syntax startportnumber_endportnumber at IG_TCP_CPORTS. For example, IG_TCP_CPORTS=“21,22,[any other ports],30000_50000”_Note that the other preceding ports might different in your server.
  • Restart APF with command: /etc/apf/apf -r

The Passive Mode FTP should be ready now.

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