We are developing a site for a client who already has an SSL certificate and already has a website and domain name that uses it. We will be hosting the new site on our server running Apache that has other sites on it with the same IP. The domain name for the website will have its A record changed to our server. The existing certificate was granted by Comodo. Another possibly important fact is the company where their existing site is hosted will not get back to us in regards to the certificate. I have asked for them to give me an "exported copy of the SSL certificate and private key" but have been ignored.
Having asked Comodo and the company who hosts our other sites for help I am really confused! I've never really dealt with SSLs before.
So my questions are:
- Is the only way of transfering this certificate to get it exported by the current hosting provider?
- If they don't respond, what are my next steps?
- Can a domain name have two certificates (if we buy a new one)?
I apologise if I am using incorrect terminology but thanks in advance!