IE Certificate Error with Signed Certificate

So, you’ve got your shiny new certificate, and your good old server. You’ve installed the certificate, chain or intermediate certificate, and all is nice and clean in FireFox, Chrome, Chromium, etc.

Then, your boss opens up his IE, and gets Certificate Error – “not issued by trusted certificate authority” and/or “issued for a different website’s address”. Of course, that’s a major pain, as IE – however bad, buggy and crappy it is – still holds majority of browsers market, as most computer users are incapable of installing a better browser.
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