Hi there. We have a two server Exchange 2010 set up: One internal server that is the Client Access and Hub Transport and an external server that is our Edge.
We have an SSL certificate from a public CA we want to present when users log in to OWA/Autodiscover/etc. We would also like to have TLS connections using an SSL cert between external SMTP servers and of course, a cert is needed to handle the Edge subscription between Edge and the Hub.
When trying to use the same certificate for these use cases, Exchange will throw an error saying: "Sharing the same certificate between Edge and Hub Transport servers is not allowed."
What's not clear from searching around is what the best practice is here: Use a public CA cert for OWA/Autodiscover/etc., and use a self-signed for SMTP/TLS? Wouldn't it be advantageous to use a public CA cert for SMTP connections between external SMTP servers? Should we buy two certs then for this case?
Thanks in advance!
You receive this error when you try to create the Edge Susbcription ( "Sharing the same certificate between Edge and Hub Transport servers is not allowed.") ?