
Originally Posted by
Trigger
Ok I was being a bit general before sorry.
At the moment you already have them setup and using nameservers, is their main account (domain.com) setup to use the shared IP on the server? If you did not change things then they should be.
An SSL certificate must have the domain on a dedicated IP address ie. no other domains can be using it, it can be used for other purposes like name servers.
So rather than use another IP address use one assigned to their nameservers.
Use WHM's "Change Site's IP Address" feature and change the IP address for domain.com from the current Shared IP address over to the first nameservers IP address 222.222.222 and then install the SSL certificate and everything will work fine.