SSL Certificate Name validation failed.

I've just transferred an SBS2003 box over to a new Server 2008R2\Exchange 2010 install and yes, I'm running an AD GC and Exchange on the same box but until I can spend more I have no resources to run any other way.  I've also just applied a new SSL certificate.  Things are 'mostly' working after much kludging around but most annoyingly I'm getting this error on testing external connections:

Certificate name validation failed.
Additional Details
Host name mydomain.com doesn't match any name found on the server certificate CN=owa.mydomain.com

Have been through the Exchange Management Console and everything external points to the CN so why is the host looking for mydomain.com?

Trying to set through the Exchange shell:
Set-ClientAccessServer -Identity CAS_Server_Name -AutodiscoverServiceInternalUri https://owa.mydomain.com/autodiscover/autodiscover.xml 

gets the result:
The operation couldn't be performed because object 'CAS_Server_Name' couldn't be found on 'server.mydomain.local'.
    + CategoryInfo          : NotSpecified: (0:Int32) [Set-ClientAccessServer], ManagementObjectNotFoundException
    + FullyQualifiedErrorId : C9111A49,Microsoft.Exchange.Management.SystemConfigurationTasks.SetClientAccessServer

So if the CAS name doesn't exist in AD how is it getting the host?  If I need to how do I make the CAS_Server_Name entry manually?

JalbkayAsked:
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JalbkayConnect With a Mentor Author Commented:
I've just had a 'Doh!' moment.  Should I be substituting 'CASServer' with my server name?
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viveksahuCommented:
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JalbkayAuthor Commented:
Hey Viveksahu,

Thanks for that but that i've actually already been there.  Regardless of the syntax, CASServer or CAS_Server_Name, Set-ClientAccessServer -Identity still gives the error:
The operation couldn't be performed because object 'CAS_Server_Name' couldn't be found.
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JalbkayAuthor Commented:
Why yes, yes I should... to long at it and no-one to see the obvious for me.  Thanks anyway.
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JalbkayAuthor Commented:
I found the error myself
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