Why do I get a "534 Protection level negotiation failed." error when attempting to transfer files to a Microsoft Internet Information Server FTPS service using lftp?

Solution Verified - Updated -

Issue

  • Why do I get "534 Protection level negotiation failed." error when attempting to transfer files to a Microsoft Internet Information Server FTPS
    service using lftp?

  • The IIS FTPS service is configured with "Require SSL connections".

Environment

  • Red Hat Enterprise Linux (client).
  • Microsoft Internet Information Server (server).
  • lftp.

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