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Installing 3rd Party SSL Certificates on to Windows Server 2008 R2/Exchange 2010

Posted on 2014-01-10
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We currently have a Self-Signed SSL Certificate on an Exchange 2010 Server running Windows Server 2008 R2. We purchased a third party certificate from Mediaura to replace our self-signed certificate. They sent us 3 Certificates and instructed us to install all 3. From IIS7, we were able to use the Complete Certificate Request to install the main mail.xxxxxx.org (SSL https:443) certificate successfully, but do not fully understand the function of the other two certificates or how they work in conjunction with the main certificate. Neither do we know how to or where to import these 2 certificates.
The certificates are called "AddTrustCARoot.crt" and "PositivesSSLCA2.crt".

Please help us to understand how these certificates work with the server certificate and what we need to do to correctly install these on our server.
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Question by:dtssupport
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Expert Comment

by:cristiantm
ID: 39771756
Those are the so called Certificate Chain.

A certificate chain is a path of certificates leading from your certificate (the server certificate) to a trusted anchor (root CA, that should probably be AddTrustCARoot.crt).

For verifying a certificate, a computer needs to know the path from the server certificate until a root CA that he alreay trusts. By intalling those in your server, you allow your server to send them to your clients so they can construct the path and decide if they want to trust the root CA or not.
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Author Comment

by:dtssupport
ID: 39771777
How do we install the AddTrustCARoot.crt?  Do we do it differently than the Server Certificate?
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Expert Comment

by:cristiantm
ID: 39771788
You can find detailed instruction for that here:
http://www.entrust.net/knowledge-base/technote.cfm?tn=8166

Just select Trusted root instead of intermediate certificate for the root CA
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Author Comment

by:dtssupport
ID: 39771803
What about the Third Certificate? Would it be imported into the Trusted root as well and do we can have to change the extensions? PositivesSSLCA2.crt
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cristiantm earned 1500 total points
ID: 39771811
This is probably the Intermediate certificate, and should be installed exactly as the instruction o the link (no need to change the storage to the trusted certificates one)
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