ADFS SSL Clarification

The goal is to setup SSO with with an external company that hosts our data.  I've just setup ADFS 2012 R2 in our network but what I'm not clear on is which SSL cert should I upload.  Our internal AD domain for example  is "" but our external domain to access the data from outside is "".

So basically, which SSL should be used to setup ADFS?  domaininc or domainsys?
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AmitConnect With a Mentor IT ArchitectCommented:
What is your federation metadata URL. Same you need to use.
Cliff GaliherConnect With a Mentor Commented:
Domainsys at a minimum.
apimentel26Author Commented:
metadata url is *
AmitIT ArchitectCommented:
You need to use
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