SSL - I am so confused

I like to think I am semi IT competent, but I am having a heck of a time getting SSL working on our server.

We already have an SSL certificate for our domain on this same server www.XXX.com and it is setup in IIS. I took the string of gibberish that our CA sent us and copy and pasted it into a .cer file that I created myself (that is what I used to import into IIS). I verified this works properly in IIS.

Following the SSL GUIDE, I thought I could simply use this same .cer file to import directly in using keytool, but it keeps telling me “INPUT NOT AN x.509 CERTIFICATE”

Can someone tell me how to get the certificate into wildfire?