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I have enabled Remote Login in System Preferences in order to sftp files from my Macbook to my android devices. On those I have AndFTP installed and it used to work without problem. Now I don't think I've done anything to my system lately, but I am no longer able to connect to the Macbook, neither from my phone nor my tablet, both with Android 7.

  • sftp localhost works
  • The other direction (FTPServer App on Android), FileZilla on the Mac stopped working as well. Upon connection, the server says 500 SSH-2.0-PUTTY_LOCAL:_MAR_20_2017_16:50:29 not understood. I am confused as to the obsolete date in this message, but understand nothing else about it.
  • I have updated my phone to android 7, but the tablet shows the same behaviour
  • using sftp from the command line to sftp into android also does not work, the server has gives the same 500 error just with a different client string

What tools can I use on macOS or Android to debug this problem?

  • Already answered here – Jakuje Apr 14 '17 at 11:15
  • That thread is more about the other direction, not phone to laptop. – oarfish Apr 15 '17 at 6:08
  • Certainly you should not connect with one protocol to the other. – Jakuje Apr 15 '17 at 17:02
  • Have you check that the date and time is correctly set on both devices? SSL requires the date to be set fairly correctly and a bad date on either device would explain the error message date. – Todd Dabney Apr 16 '17 at 20:17

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