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AD Required Ports Question

Seok Jin Ko 6 Reputation points
2022-11-16T01:02:58.823+00:00

Hello I received the following reply from the security team while checking the Active Directory server firewall.

Dangerous ports: netbios 135, 137, 138, 139, 445 and 25

details

tcp/udp 445, 135

tcp25, 139

UDP 137, 138, 139

I recognize that udp 137, 138, and 139 were used under windows 2000 and are not used in recent systems. Please check that the above ports are essential ports when configuring active directory, and answer any problems that may occur when blocking.

thank you

Windows for business | Windows Client for IT Pros | Directory services | Active Directory
Windows for business | Windows Server | User experience | Other
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  1. Anonymous
    2022-11-16T01:56:59.14+00:00

    The ports required are listed here.
    https://learn.microsoft.com/en-us/troubleshoot/windows-server/identity/config-firewall-for-ad-domains-and-trusts#windows-server-2008-and-later-versions

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