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.

Match a TLS Certificate with Its Private Key November 21, 2017

Match a TLS Certificate with Its Private Key

Lose track of which private key pairs with which certificate? Use OpenSSL to compare public key hashes and confirm the match in seconds.
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LDAP Server-Side and Client-Side Result-Error Codes October 17, 2017

LDAP Server-Side and Client-Side Result-Error Codes

A quick reference for LDAP result and error codes, covering both server-side responses and client-side indicators, including Active Directory-specific sub-codes under error 49.
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Kerberos Encryption Type By Number (enctype) September 7, 2017

Kerberos Encryption Type By Number (enctype)

A quick reference for Kerberos enctype numbers and what they map to, so you can stop guessing which cipher a ticket is actually using.
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HDFS Proxy Users September 6, 2017

HDFS Proxy Users

HDFS proxy users let you configure impersonation so specific users can submit jobs or access HDFS on behalf of others. This guide covers the core-site.xml properties, host and group restrictions, and Kerberos considerations for secure clusters.
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PTR Records & Kerberos September 5, 2017

PTR Records & Kerberos

A valid PTR record must resolve to a name that resolves back to the original address. Multiple PTR records for a single address break name resolution and can cause Kerberos ticket verification to fail.
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The Unspecified Crime of the Failed Checksum August 31, 2017

The Unspecified Crime of the Failed Checksum

A quick reference for the six most common causes of the Kerberos GSS-API checksum failure error, from wrong passwords to time skew and SPNEGO canonicalization issues.
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