How do I disable Outlook Anywhere Externally with Split-DNS?

Hello,
I am trying to disable Outlook Anywhere Externally. This issue is that we use split-dns and all of our Exchange services point to mail.domain.com both internally and externally. This can't be changed due to our SSL certificate not including the internal
server DNS name for the Exchange server, and we still have another two years on it.
Is there a way to white-list a range of IP Addresses (potentially through IIS since Outlook Anywhere uses HTTPS)? Would setting the External URL to null for Outlook Anywhere prohibit autodiscover from configuring the Outlook client, or would it do nothing
at all since the internal DNS name is the same as the external?
I could potentially add an internal SSL certificate and change the internal DNS name of Outlook Anywhere. Is this a good move?
Thank you for your time.

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Regards, Sunny Kewalramani.

Hi,
Firstly, I'm afraid that we cannot disable Outlook Anywhere for certain users only when they use OA externally. And if the property MAPIBLOCKOutlookRpcHttp of a user is set to true, the user cannot access Exchange server both internally and externally.
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One of my customer wants to disable outlook anywhere for some of the users who are working from home.They have exchange server 2013 in their premises and also have outlook 2010/2013 on their clients machine.Please advice?

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In Exchange 2013, all Outlook connectivity (Internal and External) are using Outlook Anywhere anyways. It is not recommended to use the following command to disable Outlook Anywhere for a specific user:
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do I need to enable outlook anywhere External Url(or this optional)
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thanks

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The problem has existed since Exchange 2007. That article just illustrates the issue.
Here is another.
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Hi,
According to your description, you have minimized the certificate names before you set the internal and external host names of Outlook Anywhere and other services' URLs. If I misunderstand your meaning, please feel free to let me know.
If yes, As Martina said, I recommend you set all URLs and internal and external OA host names with the name mail.company.com. Then we can confirm the internal DNS record about the name. To test Autodisocver, we can directly access its URL which is set in
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Additionally, based on my research, for the error when you run the New-TestCasConnectivityUser.ps1 script, you can opened the script in notepad and found the line beginning “new-mailbox” – and deleted the parameter “–OrgainisationalUnit:$OrganistationalUnit”:
http://www.definit.co.uk/2011/03/exchange-2010-createtestuser-mailbox-could-not-be-created-verify-that-ou-users-exists-and-that-password-meets-complexity-requirements/
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How do I disable Outlook Anywhere Externally with Split-DNS?

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