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Exchange 2010 Certificate Problem

Posted on 2009-12-29
Medium Priority
Last Modified: 2012-05-08

We have just set up a new Exchange 2010 server. I have imported our SSL certificate in for mail.mycompany.com and we can use OWA without any certificate errors.

When we load Outlook on our lan though, as it loads we get a security error saying that the certificate is for the wrong domain name. Obviously when Outlook connects to Exchange it is connecting to the machine name (eg. exch.domain.local), problem is it is presenting the certificate for mail.mycompany.com thus the error.

How do I configure Exchange so that when Outlook connects it uses the self signed (or a cert signed by our enterprise CA) instead of the mail.mycompany.com cert?

If I configure IIS to use the exch.domain.local one, Outlook works fine but obviously OWA doesnt. If I configure IIS to use the mail.mycompany.com one then OWA works fine but Outlook doesn't.
Question by:aholling
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Accepted Solution

Glen Knight earned 2000 total points
ID: 26143712
You need to install a SAN/UCC certificate that contains both names along with the autodiscover.domainname.com have a look at the multiple domain certificates from GoDaddy.
LVL 74

Expert Comment

by:Glen Knight
ID: 26143730
The alternative as a temporary measure is to create a spilt DNS.

I.e create a zone for your external domain name in your internal DNS and then create an A record for mail and point it to your internal Exchange Servers IP address.

Author Closing Comment

ID: 31671095

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