Accessing website returns ERR_SSL_PROTOCOL_ERROR

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@9peppe
grep -r 443 /etc/apache2
/etc/apache2/sites-available/000-default-le-ssl.conf:<VirtualHost *:443>
/etc/apache2/sites-available/default-ssl.conf:
/etc/apache2/ports.conf: Listen 443
/etc/apache2/ports.conf: Listen 443