The error message ERR_SSL_PROTOCOL_ERROR error indicates that the browser is not able to initiate the secured communication at the moment. It's almost impossible to pin it down to a single cause, it could be almost anything. There is no definite guide for managing this error. However, there are few changes or settings which help you to get rid you of this error.

    Configure Correct Date and Time
    Clear Browsing Data
    Clear Your SSL State
    Disable QUIC Protocol of Chrome
    Disable your Internet Browser Extensions
    Adjust Your Internet Security and Privacy Level
    Remove your system's hosts file
    Check Your Antivirus Settings
    Check Your Firewall

Well, https://www.skyboundaviation.pw:80/Gallery/ will never work because it assumes port 443 by https and port 80 by reference. Mismatch.

Check your apache config if there is anything that adds a port 80 somewhere. Thenadd this to make your site always use https:

<VirtualHost *:80>
RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI}
</VirtualHost>