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.

Realm Detection and Pathing in the JSSE (Java) August 22, 2017

Realm Detection and Pathing in the JSSE (Java)

A look at how Java’s built-in Kerberos implementation uses cRealm and sRealm to determine the path between client and service realms, including hierarchical traversal and capaths configuration.
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"Not That Key!" No, Your Other Key... August 21, 2017

"Not That Key!" No, Your Other Key...

Kerberos error 44 occurs when the keytab KVNO does not match the KDC database. This guide walks through diagnosing the mismatch and regenerating the keytab to restore authentication.
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Java SSLHandshakeException: No Cipher Suites in Common August 21, 2017

Java SSLHandshakeException: No Cipher Suites in Common

A common Java SSL handshake failure stems from passing a null KeyManager array when initializing the SSLContext, which silently disables all certificate-based cipher suites. This post walks through the root cause and the four most frequent triggers behind the error.
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Handling Multiple CNs on a Single Certificate August 18, 2017

Handling Multiple CNs on a Single Certificate

Multiple CNs in a certificate Subject field are deprecated and cause compatibility failures. The SAN extension is the correct way to cover multiple names on a single certificate.
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Error 53: The Server Has Left the Chat August 16, 2017

Error 53: The Server Has Left the Chat

LDAP error 53 means the destination server is refusing a password change request. This post walks through the most common Active Directory requirements and policy settings that trigger the error.
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Lost in the Realm: Kerberos Dropped the Map Again August 16, 2017

Lost in the Realm: Kerberos Dropped the Map Again

A quick troubleshooting guide for the ‘Server not found in Kerberos database’ error, covering the four most common root causes and how to verify each one.
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