TNS-12631: Username retrieval failed


Sometimes You can get “TNS-12631: Username retrieval failed ” error.


Details of error are as follows.

TNS-12631: Username retrieval failed
Cause: The authentication service failed to retrieve the name of a user.
Action: Enable tracing to determine which routine is failing.




To solve this problem, change SQLNET.AUTHENTICATION_SERVICES= (NTS) parameter to SQLNET.AUTHENTICATION_SERVICES = (NONE) on sqlnet.ora under $ORACLE_HOME/NETWORK/ADMIN directory.


After changing this parameter, check again it will be solved.


PS C:\Users\Mehmet>
PS C:\Users\Mehmet> sqlplus / as sysdba

SQL*Plus: Release Production on Thu Jul 4 12:06:54 2019

Copyright (c) 1982, 2010, Oracle. All rights reserved.

Connected to:
Oracle Database 12c Release - 64bit Production


Do you want to learn more details about RMAN, then read the following articles.


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About Mehmet Salih Deveci

I am Founder of SysDBASoft IT and IT Tutorial and Certified Expert about Oracle & SQL Server database, Goldengate, Exadata Machine, Oracle Database Appliance administrator with 10+years experience.I have OCA, OCP, OCE RAC Expert Certificates I have worked 100+ Banking, Insurance, Finance, Telco and etc. clients as a Consultant, Insource or Outsource.I have done 200+ Operations in this clients such as Exadata Installation & PoC & Migration & Upgrade, Oracle & SQL Server Database Upgrade, Oracle RAC Installation, SQL Server AlwaysOn Installation, Database Migration, Disaster Recovery, Backup Restore, Performance Tuning, Periodic Healthchecks.I have done 2000+ Table replication with Goldengate or SQL Server Replication tool for DWH Databases in many clients.If you need Oracle DBA, SQL Server DBA, APPS DBA,  Exadata, Goldengate, EBS Consultancy and Training you can send my email adress [email protected].-                                                                                                                                                                                                                                                 -Oracle DBA, SQL Server DBA, APPS DBA,  Exadata, Goldengate, EBS ve linux Danışmanlık ve Eğitim için  [email protected] a mail atabilirsiniz.

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