I assume you have installed it on your local machine with some self-signed certificate? Not very sure but I assume also that there is some misconfiguration with your webserver and the SSL handling. Have you checked once the Browser Network tab for some redirects from https to http or other way around? As far as I know you don’t need to configure anything special in Neos to make it work with SSL/TLS, this should be transparent on the transport layer. What you would need to check is if you would have any proxies, see for example this topic here: SSL, HTTPS configuration - #5 by mcyg