If you’ve ever gotten to a point where you’ve created your site collection (Top-level site) and decided later on to utilize SSL Certificates here is what you need to do in SharePoint to get this to work. This will not go over how to set it up in IIS since it’s assuming you’ve already done this and now you can’t access your site.
You’ll want to go into Central Administration, Operations and Alternate Access Mappings. You should have a list similar to the below example:
You’ll want to click on your site’s URL and change it to https://”yourportalname” (see image below)
Hit OK and you should now be able to access your site. Anytime you install an SSL Certificate and then have issues connecting to one or more of your site collections it usually has to do with Alternate Access Mappings so be sure to check that these are correct.