How to Disable Exchange 2016(CU19) ECP External Access (Without breaking OWA)

Sathishkumar Singh 486 Reputation points
2021-03-11T08:50:30.067+00:00

Hello Support

My Current infra

1-Primary AD
1-Secondary AD
2-Child Domain
2-RODC

1-Standalone Exchange Server 2016(CU19)

How to Disable Exchange 2016(CU19) ECP External Access (Without breaking OWA)
it should be able to access internally ECP with same as External.

Please share me step by step guide to avoid impact during Disabling EAC

Also i read article says that it may break OWA during Disabling EAC

Please advice

Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
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  1. KyleXu-MSFT 26,211 Reputation points
    2021-03-12T02:53:54.143+00:00

    @Sathishkumar Singh

    Here are step by step to disable EAC from accessed from external of your organization, you still could access it from the internal of your organization. It doesn't effect the using of OWA: Turn off access to the Exchange admin center

    You can also install an Exchange 2019，then using Exchange 2019 as the Internet facing server, the new function "Client Access Rules" is more easier to control the access of EAC.

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