ORA-12571: TNS packet writer failure


Sometimes You can get “ORA-12571: TNS:packet writer failure ” error.


Details of error are as follows.

ORA-12571: TNS:packet writer failure
Cause: An error occurred during a data send.
Action: Not normally visible to the user. For further details, turn on tracing and reexecute the operation.
If error persists, contact Oracle Customer Support.



This error may be related with the NLS_NCHAR_CHARACTERSET option is set to AL16UTF16.

To solve this error, Change the NLS_NCHAR_CHARACTERSET to UTF8.


Or This error may be related with the Firewall settings.

To solve this error, Disable the firewall in Windows or Linux reading the following post.







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 mehmetsalih.deveci@outlook.com.-                                                                                                                                                                                                                                                 -Oracle DBA, SQL Server DBA, APPS DBA,  Exadata, Goldengate, EBS ve linux Danışmanlık ve Eğitim için  mehmetsalih.deveci@outlook.com a mail atabilirsiniz.

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