IIS SSL Certs
From KOP KB
Favorite links for SSL
Create Certificate request
https://www.digicert.com/csr-creation-microsoft-iis-7.htm
Complete Certificate request
https://www.digicert.com/ssl-certificate-installation-microsoft-iis-7.htm
Private Key Doesn't Match
Pretty much means you need to automatically create a new cert request to then complete, for some reason IIS just loves messing private keys up
NOTE: If you can still see the request in MMC Console with the SSL snap-in you could possibly export and reimport it.
Can't get to site from server or elsewhere
In the bindings part of the website the ip address needs to be *