TNS-12636: Packet send failed


Sometimes You can get “TNS-12636: Packet send failed ” error.


Details of error are as follows.

TNS-12636: Packet send failed
Cause: A process was unable to send a packet to another process. Possible causes are:1. The other process was terminated.

2. The machine on which the other process is running went down.

3. Some other communications error occurred.

Action: If the cause is not obvious, contact Oracle Customer Support.




As an immediate workaround, disable Kerberos Authentication in the sqlnet.ora file.
The following lines may or may not be included, so comment all relevant lines to be sure:


# SQLNET.KERBEROS5_CC_NAME = /var/opt/oracle/krb/cc/krb5cc_11
# SQLNET.KERBEROS5_CONF = /var/opt/oracle/krb5.conf
# SQLNET.KERBEROS5_KEYTAB = /var/opt/oracle/ora1111.keytab

Now when connecting, it should work or progress to the next logical error:

$ sqlplus rcrow/<pwd>@MSDB

SQL*Plus: Release Production on Fri Jun 29 14:13:47 2018

Copyright (c) 1982, 2014, Oracle. All rights reserved.

Last Successful login time: Fri Jun 29 2018 14:11:44 -04:00

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




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


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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