FTP and SSH connection not possible

Hello,

I would like to be able to connect via SSH or FTP (sftp) to my proxmox server but I can't and I don't understand why.
I'm sure the username, password and ip address are correct. In addition, I've generated an ssh key pair on my local machine and I've passed the public key to my server, but it's still impossible to connect.

SSH error : Permission denied, please try again.
FTP error : Error: Unable to establish connection to server

I can't find a solution, but there shouldn't be a...

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