Troubleshooting

Enable verbose Kerberos and token logging on Spark driver and executor nodes to capture the diagnostic data you need when authentication is failing. Covers log4j configuration files and the exact spark-submit flags to wire them in.

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.

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.

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.

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.

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.