You need to slow down with what you are changing here, as at the moment you appear to be just changing things and hoping for the best. The first thing you need to do is get back to where you were above when my colleague mentioned you need to contact you host. You had a 500 error, which is an internal server error. These are logged within your server error logs. If you are unsure on how to get the logs, you need to contact your host
It absolutely does matter, yes. If your server is pointing to http then your conf_global needs to point to the same. And the same for https.