Exchange hybrid modern authentication firewall

Jeroen Bonsel 6 Reputation points
2020-12-16T09:44:27.227+00:00

I have a question about hybrid modern authentication.

When we want to setup hybrid we can choose to allow only traffic from office 365 endpoints as described here:

https://learn.microsoft.com/en-us/exchange/hybrid-deployment-prerequisites#hybrid-deployment-protocols-ports-and-endpoints

When I want to enable hybrid modern authentication, and allow laptops to connect to exchange on prem, do I need to further open the firewall? Are there seperate firewall requirements for modern authentication in exchange on prem? Or are these the same as for "normal" hybrid exchange?

Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
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  1. Ashok M 6,506 Reputation points
    2020-12-16T10:47:06.03+00:00

  2. KyleXu-MSFT 26,241 Reputation points
    2020-12-17T06:53:43.56+00:00

    @Jeroen Bonsel

    The hybrid Modern Authentication still using 443 port: Using hybrid Modern Authentication with Outlook for iOS and Android


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