ORA-12532: TNS:invalid argument


Sometimes You can get “ORA-12532: TNS:invalid argument ” error.


Details of error are as follows.

ORA-12532: TNS:invalid argument
Cause: An internal function received an invalid parameter.
Action: Not normally visible to the user. For further details, turn on tracing and reexecute the operation.
If error persists, contact Oracle Customer Support.


You may check the same by trying a telnet to the listener port from the same client where sqlplus connection failed.

$ telnet <db server IP> <listener Port>

The above would return a blank screen with blinking cursor. Note that the above would also fail if you are facing transport issues.

As the underlying cause for the issue is the firewall that has been enabled, take assistance of the network administrator to momentarily disable the firewall on the server host

Once done, re-try the connection from the client host.

There is an unpublished internal bug 6031201 being worked upon by our development team to correct the error code raised from client. Incorrect error message “TNS:invalid argument” being reported is misleading and needs to corrected to something like “TNS:connection refused”


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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