Luke Hebert
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Welcome to the articles section, where business, technology, and everyday problem-solving meet. You’ll find practical how-tos, troubleshooting notes from the trenches, and the occasional take on whatever’s happening in the world. Some posts will save you time, some will spark ideas, and a few will just be me thinking out loud. Grab a coffee and dig in.

Common Error Codes for Active Directory Authentication November 24, 2020

Common Error Codes for Active Directory Authentication

A quick reference for the LDAP error codes returned during Active Directory bind operations, including what each code means and how to interpret the AcceptSecurityContext error message.
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Cannot Find Key of Appropriate Type, Kerberoasting & Hadoop November 3, 2020

Cannot Find Key of Appropriate Type, Kerberoasting & Hadoop

A troubleshooting guide for the Kerberos error ‘Cannot find key of the appropriate type to decrypt AP REP,’ covering encryption type mismatches between keytabs and Active Directory, plus practical steps to align AES and RC4 settings.
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Is Unlimited JCE Working? How to Actually Test It July 7, 2020

Is Unlimited JCE Working? How to Actually Test It

A quick reference for which JDK releases ship with Unlimited Strength JCE enabled by default, plus a small test program to verify your environment.
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Why You Can't Afford to Ignore the TLS Version Field December 4, 2018

Why You Can't Afford to Ignore the TLS Version Field

The version field in a TLS ClientHello message tells the server the highest protocol version the client supports, but it appears in three distinct places with different roles. Understanding where and how each version field is used helps troubleshoot handshake failures and interoperability issues with legacy implementations.
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Checking Hole Punching February 6, 2018

Checking Hole Punching

Learn how to verify that your file system supports hole punching by creating a test file, punching a hole with fallocate, and confirming the space savings with du.
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HDFS NameNode Memory Sizing When Using HDFS Encryption January 11, 2018

HDFS NameNode Memory Sizing When Using HDFS Encryption

Enabling HDFS encryption at rest adds per-file metadata overhead to the NameNode heap. This guide breaks down the memory impact and gives a practical rule of thumb for right-sizing your NameNode heap.
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