Exchange 2010 CAS setup getting this error "The host specified for the "ExternalUrl" parameter can't be resolved"

I am installing my first Exchange 2010 in my environment.
This will be a 2003 to 2010 transition.  
I am using a wildcard SSL from Godaddy.
I installed the CAS role on server and started the Autodiscovery setup. I was able to set the external address for OAB (Default Web Site).

Set-OABVirtualDirectory -Identity "CAS01\OAB (Default Web Site)" -ExternalUrl https://mail.contoso.com/OAB -RequireSSL:$true

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When I run the command for EWS (Default Web Site) I get  "The host specified for the "ExternalUrl" parameter can't be resolved"

Set-WebServicesVirtualDirectory -Identity "CAS01\EWS (Default Web Site)" -ExternalUrl https://mail.contoso.com/EWS/Exchange.asmx -BasicAuthentication:$True

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LVL 26
yo_beeDirector of Information TechnologyAsked:
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tshearonCommented:
Try this in EMS and see if you get a value for externalurl:

Get-WebServicesVirtualDirectory | fl server,externalurl
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tshearonCommented:
Tell me you are not using Mail.contoso.com and instead are using your mail domain name for the externalurl property. I'm pretty sure you aren't using contoso but if I didn't say it and you were then we would look pretty silly.
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yo_beeDirector of Information TechnologyAuthor Commented:
@tshearson:
I am not. :)

I ran the
[PS] C:\Windows\system32>Get-WebServicesVirtualDirectory | Set-WebServicesVirtualDirectory -ExternalUrl https://mail.xxxxxx.com/EWS/Exchange.asmx -BasicAuthentication:$True

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Then
Get-WebServicesVirtualDirectory -Identity "xxxEXCAS01\EWS (Default Web Site)"

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Now I do not get the error, but I do not see the column for the ExternalURL like I did with
get-OABVirtualDirectory

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Even though I do not see the external url column does this mean that it is configured correctly?
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yo_beeDirector of Information TechnologyAuthor Commented:
Thanks guys.  
I added Host A Record  to my DNS zone xxxxxxx.com for Mail prior to running the Set-WebServicesVirtualDirectory.
That might have done the trick.  
I feel that you both deserve the points.

Thanks
Mike
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