Can't ssh/sftp anymore after installing the ssl certificate

I can’t ssh/sftp anymore after installing the ssl certificate on LAMP Ubuntu. It was ok before that. What did I do wrong?

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I can’t login with the console as well from the droplet itself. it says “authentication method failed” all this issues appears after I setup a SSL certificate and attach a domain name to the droplet.

Installing an SSL certificate typically doesn’t have any relation to the SSH connection. Have you made any firewall changes along the way as that could have impacted SSH port. Typically with any firewall issues, you would get an error like “Connection timed out” or “Operation time out”. Also make sure to check that the ssh service is actually running by logging in via the Recovery console.