TCP 989
Synopsis
- TCP port 989 is the well-known port for FTPS data in implicit FTPS (FTP over TLS/SSL).
- In implicit FTPS, the control channel is on TCP 990 and the data channel uses TCP 989.
- Microsoft IIS FTP Service (Windows Server) supports implicit FTPS and uses 990/989 when enabled.
- FileZilla Server supports implicit FTPS and uses 989 for the data connection.
- vsftpd and ProFTPD (with mod_tls) can be configured for implicit FTPS, using 989 for data.
- Commercial servers like Globalscape EFT/Serv-U and Progress WS_FTP Server implement implicit FTPS with data on 989.
- NAS platforms such as Synology DSM and QNAP offer an “Implicit FTPS” option that uses 990 for control and 989 for data.
- Clients like FileZilla and WinSCP interoperate with these servers when “FTPS (Implicit)” is selected, using 989 for the data channel.
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