What are the required TCP/UCP ports for Kerberos communication?

From	Bassam Ballaji <bassam.ballaji@gmail.com>
Newsgroups	comp.protocols.kerberos
Subject	What are the required TCP/UCP ports for Kerberos communication?
Date	2025-08-29 19:48 +0200
Organization	TNet Consulting
Message-ID	<mailman.2.1756493419.2340612.kerberos@mit.edu> (permalink)
References	<CAGA_OYeeO9SJy7Y5kB01uZzf6Y6PpB0oLGx2OL5TXU-rsNBMOQ@mail.gmail.com>

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Hello,

My name is Bassam BALLAJI and I'm an IT professional.

Today, I'm implementing Kerberos authentication for a business application
layer access to let the users authenticate with an external active
directory using LDAPS protocol.

My implementation follows the article below, chapter 1, paragraph "what is
Kerberos?" :
https://techcommunity.microsoft.com/blog/askds/ntlm-vs-kerberos/4120658

I need to know which TCP/ UDP ports are required for the flows 5 + 6,
between client app and service server (not domain controller).

Thanks in advance for your help.
Regards,

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What are the required TCP/UCP ports for Kerberos communication? Bassam Ballaji <bassam.ballaji@gmail.com> - 2025-08-29 19:48 +0200

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