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Why the FTP server needs port 20 to be opened while connecting via FTP Active Mode?

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Stefan Yakubov
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Plesk for Windows Plesk for Linux kb: how-to ABT: Group B

Applicable to:

  • Plesk for Linux
  • Plesk for Windows

Question

Why the FTP server needs port 20/tcp to be opened while connecting via FTP Active Mode?

Answer

The incoming traffic to port 20/tcp(ftp-data) has to be allowed in order to establish the FTP data transfer while connecting via FTP Active Mode.

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