4

Reproduction

  • macOS 11 Big Sur
  • Finder > Main Menu > Go > Connect to server… (⌘-K)
  • Field allows ftps:// scheme. That is FTP in a SSL/TLS tunnel:

    Finder > Connect To Server > FTPS protocol scheme

Questions

  • Is Finder actually using FTPS?
  • If so, which one?
    • Implicit FTPS (connecting to port 990)
    • Explicit FTPS (connecting to the regular FTP port 21 and then SSL/TLS handshake)?
  • Will Finder ever fallback to FTP? If so, will it tell me?
  • I would like to know this beforehand using it on a regular basis.
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1 Answer 1

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9

No! Beware: Even though you explicitly requested FTPS, Finder actually uses FTP !

Apple documentation / feedback

From the Finder, you can connect to FTP servers only with read-only access. To copy files to an FTP server, use an FTP app.

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  • 3
    This sort of how to use Wireshark is always awesome - thanks for the alert on security Commented Jul 1, 2021 at 10:06
  • You're welcome! When I had already done the heavy research myself, I though I better share it with the Apple community. Thank you at StackExchange for offering and encouraging to "answer your own question". And yes Wireshark is great for getting real confirmation on network issues! Commented Jul 6, 2021 at 12:38

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