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


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?  


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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 (for OWA) (for the autodiscover service)

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.



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Also, i found this article useful for creating SAN certificates when testing using my own certificate authority on windows server 2003.
markholmes24Author Commented:
BiPod - many thanks for that.
markholmes24Author Commented:
Cheers BiPod!
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