Kerberos Authenticated Network Connection Fails Because it Cannot Build the Realm (Doc ID 182979.1)

Last updated on NOVEMBER 04, 2015

Applies to:

Oracle Database - Enterprise Edition - Version 9.2.0.1 to 11.2.0.3 [Release 9.2 to 11.2]
Advanced Networking Option - Version 9.2.0.1 to 11.2.0.3 [Release 9.2 to 11.2]
Information in this document applies to any platform.
Checked for relevance on 11-Jun-2013

Symptoms

Kerberos authenticated network connection fails with  TNS-12638 / ORA-12638: Credential retrieval failed.

Client sqlnet trace shows the failure occurs building server principal with the error "Unable to get locate hosts realm"

Changes

CHANGE NOTE: Use level 16 client network trace. The failure occurs at  function nauk5lu_get_host_realm. Further down in the trace there is a message  stating "Couldn't build server principal".

Cause

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