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How to allow FTP through firewall


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I am using Internet Security 12.0.31.0 on a laptop running Windows 10 Pro (64 bit) v 10.0.17134 and trying to use laptop as an FTP server (previously used a spare desktop) to receive backups from a remote server via FTP.

Tested laptop server with ESET firewall disabled.

Please advise how I can allow FTP through the ESET firewall 

Thank you

Andrew Hayns

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It depends on whether the ftp server works in active or passive mode.

In active mode the following communication must be permitted:

  • FTP server's port 21 from anywhere (Client initiates connection)
  • FTP server's port 21 to ports > 1023 (Server responds to client's control port)
  • FTP server's port 20 to ports > 1023 (Server initiates data connection to client's data port)
  • FTP server's port 20 from ports > 1023 (Client sends ACKs to server's data port)

In passive mode:

  • FTP server's port 21 from anywhere (Client initiates connection)
  • FTP server's port 21 to ports > 1023 (Server responds to client's control port)
  • FTP server's ports > 1023 from anywhere (Client initiates data connection to random port specified by server)
  • FTP server's ports > 1023 to remote ports > 1023 (Server sends ACKs (and data) to client's data port)
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