To access emerDNS sites, you need to do any of the following preparatory steps:
If you would like to access emerDNS web-sites through https (for example - this site by URL https://sites.emc/) without browser's warning window, you need to download and install into your browser or OS the "PostMet Root CA Class 1" SSL-certificate from the page: http://www.postmet.com/securepost.
To request SSL-certificate for your site within emerDNS, send your CSR (Certificate Signing Request) to Postmet: https://www.postmet.com/csr/