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Gill-Bates
Asked: 2020-10-10 04:18:14 +0800 CST

Windows Server Firewall Ports - Unidirectional or Bidirectional?

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I want to configure open ports for a firewall (3rd Party Product) to allow communication between a Domain Controller (DC) and a client (and vice versa). OS: Windows 2016/2019. The documentation from Microsoft describes which ports are required for basic services:

https://docs.microsoft.com/en-us/troubleshoot/windows-server/identity/config-firewall-for-ad-domains-and-trusts#windows-server-2008-and-later-versions

Unfortunately, it is silent about the direction in which port sharing must be done. The firewall is stateful. If I configure the port sharing unidirectional, only the client should initiate the connection and answer the DC. But not the other way around.

firewall windows-server-2019 windows-server-2016

1 Answers

  1. Unfortunately, it is silent about the direction in which port sharing must be done.

    The Windows Firewall by default allows outbound traffic. So open inbound traffic to the ports shown in column Server Port.

    enter image description here

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