Technology

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.

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.

Walk through inspecting a Hue keytab file, verifying its principals with klist, and confirming that the resulting ticket carries the Renewable flag Hue requires for long-running service operations.

Hue returns a Permission Denied error when the IDP sends custom SAML attributes that pysaml2 cannot map. This guide walks through creating an attribute mapping file and configuring Hue to resolve the issue.

Kerberos authentication failures can be frustrating to debug. Setting the KRB5_TRACE environment variable gives you detailed library-level logging that pinpoints exactly where the exchange breaks down.

A quick reference for diagnosing Kerberos authentication failures in Active Directory, covering the lockout state machine and the specific error codes (5be, 775, 18) that indicate revoked credentials or a locked account.