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Do I need to purchase a certificate to use RPC over HTTP with Exchange 2007

Posted on 2008-06-26
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Last Modified: 2010-04-21
Hi,

I am in the process of setting up Exchange 2007.  

OWA will work with the built-in default certificate but I think I read somewhere that RPC-HTTP needs a trusted cert to work.  Does this mean I will need to purchase one?  

Thanks,

Mark
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Question by:markholmes24
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BiPod earned 500 total points
ID: 21875371
Depending on your environment you will either need a self signed Subject Alternative Name (SAN) certificate or you will have to purchase a SAN certificate.

If you go for a self signed certificate using your own certificate authority you'll obviously have to provide the trusted root certificate to your end users otherwise they'll get a certificate security warning when trying to conenct via RPC-over-HTTP.  If you go for a purchased certificate (from someone like Digicert who are very good) then the root certificates come pre installed on the client Operating System.

I went with a Digicert certificate and included the following SANs in it

mail.domain.com (for OWA)
autodiscover.domain.com (for the autodiscover service)
CAS.server.fqdn
CASServer

This essentially allowed me to get everything from Outlook on the LAN to OWA and RPC-over-HTTP (with autodiscover) working without any security warnings.

Cheers

BiPod
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Expert Comment

by:BiPod
ID: 21875472
Also, i found this article useful for creating SAN certificates when testing using my own certificate authority on windows server 2003.

http://support.microsoft.com/kb/931351
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Author Comment

by:markholmes24
ID: 21875648
BiPod - many thanks for that.
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Author Closing Comment

by:markholmes24
ID: 31470985
Cheers BiPod!
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