Issues with iPhone and Android connecting to Lync 2010?

Our environment currently consists of a single Lync 2010 instance, which is currently performing all roles. The current challenge I'm running into is connectivity to iOS and Android devices not wanting to cooperate. Currently, Lync is using a certificate
issued by a local CA. The CA root certificate has been imported to the devices that are having trouble connecting, and I've done this via email import without success, as well as using the iPhone Configuration Utility. In all tested instances, an error that
"the certificate can't be verified" is displayed that prohibits a user from establishing a connection. All domain workstations and remote users that import the root CA have no issues connecting.
I can't seem to figure out what's going on here. Has anyone run into this? This is a quasi-test environment in my lab that I'm testing with a few other people, and as much as we've tried, can't seem to figure out the issue. Any ideas?

To confirm that the certificate has been installed successful do you have a corporate website that is available externally that uses a certificate issued by the CA in question? If the answer is yes I would browse to that site on the phone and see if you
get an error. The Lync mobile clients don't give you a heck of a lot of information for troubleshooting. This will rule out a certificate issue.
Next thing would be your reverse proxy. Are you using ISA server? Test the reverse proxy rule by browsing to the Lync mobile auto discover URL - https://lyncwebexternal.domain.com/Autodiscover/AutodiscoverService.svc/root
Assuming ISA also make sure the rule is configure correctly -
http://technet.microsoft.com/en-us/library/hh690011.aspx
http://blogs.technet.com/b/nexthop/archive/2012/11/19/configuring-reverse-proxy-for-lync-server-2010-mobility.aspx
Let me know what the results are of those tests.
Andrew Morpeth
Lync Server Specialist - Auckland, NZ
Check out my blog

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