Troubleshooting

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.

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.

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.

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.

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.

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.