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How to AutoEnroll to servers behind Firewall

To have AD push machine certificates to laptops and desktops, I have used AutoEnroll feature by joining an AD Global group containing the machine IDs of the target machines.  This has worked fine…..but what I need to figure out now is a little different:

We have several Windows 2003 servers that need a machine certificate (for server authentication).  I can use the same process as I have listed above, but the difference is that these servers are behind a special secure zone (firewalled for PCI purposes).  

How do I accomplish AutoEnrollment of certificates to servers that are behind a firewall.  Would I have to have ports opened ??  Which ones ?? and where ?? on the target servers or the Issuing CAs ??
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you can use internet enrollment, but will have to install IIS server/role.  port 443 needs to be opened.
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Can you please give me more details on what you mean by 'internet enrollment'.....

IIS is already installed as a Role on the Issuing CA and the target servers already have IIS installed as well.  

Port 443 needs to be opened where ?? on the Issuing CA or the target servers (sorry I am not very knowledgeable about this)..

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