The server's certificate is unknown

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Ninno
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Joined: 2020-05-05 08:34

The server's certificate is unknown

#1 Post by Ninno » 2020-05-05 08:39

Hello,
I took a certificate for my server from the Let's Encrypt authority and uploaded it to my Filezilla server.
But when I connect to the server through my filezilla client, I still receive a certificate unknown error, and I have to manually accept it with a valid certificate by selecting the appropriate flag. (see attach)

The hostname is the same and I have also activated the reverse on the public ip, how can I avoid this message?

Thanks
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botg
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Re: The server's certificate is unknown

#2 Post by botg » 2020-05-05 09:43

Yes, FileZilla uses user-guided Trust On First Use (TOFU). You need to compare the displayed fingerprint with the actual fingerprint you have received from the server administrator through a different, secure channel. It's just like with SSH host keys, same principle.

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