Shared key for use with FIleZilla + Let's Encrypt?

Hello @misterprotocol, welcome to the Let's Encrypt community. :slightly_smiling_face:

FTP is not in the set of Challenge Types - Let's Encrypt
There is

  • HTTP-01 challenge challenge can only be done on port 80.
  • DNS-01 challenge your client will create a TXT record derived from that token and your account key, and put that record at _acme-challenge.<YOUR_DOMAIN>.
  • TLS-ALPN-01 it is performed via TLS on port 443.
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