I see you use a Chrome browser.
Can it be that your server has a ssl config that is too old? Chrome only accepts TLS1.1 or higher. So is ssl2/3/tls1.0 is specified on the serverside, Chrome will not accept a connection.
The simpleserver must specify tls1.1 at a minimum, since even recent openssl does not compile in those old and insecure protocols as standard.