How to encrypt usernames and passwords when using gftp with proftpd.
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Proftpd server settings:
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Set "Use FTP-TLS secure communications" to "On"

Set "Require encryption on channels" to "Control"
(This means authenticate via TLS/SSL, data is not encrypted)

Set "Verify clients" to "Off"

Fill in the certificate settings.

Click on the "Generate a new selfsigned certificate" apply button.

Restart the server.


GFTP settings:
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Select "FTP" in the menu then select "Options".

Select the "SSL-Engine" tab.

Uncheck the "Verify SSL Peer" option.

Click "Apply" then "Ok".