TNS-12564: TNS connection refused


Sometimes You can get “TNS-12564: TNS:connection refused ” error.


Details of error are as follows.

TNS-12564: TNS:connection refused
Cause: The connect request was denied by the remote user (or TNS software).
Action: Not normally visible to the user. For further details, turn on tracing and reexecute the operation.



This error may be related with the listener, so Make sure that The listener is up and running properly.


The other case is The listener received a request to establish a connection to a database or other service, so create a new static listener.

To solve this error, you can create a static listener and start it as follows.

Add the following listener descriptions to the listener.ora file under $ORACLE_HOME/network/admin.


Check your Hostname, Port, DB Name and fill them correctly.


(ORACLE_HOME = /u01/app/db_home_18c )

[oracle@msdbadm01 ~]$ lsnrctl start LISTENER


Or Restart database and listener.

LSNRCTL> start

SQL> shutdown immediate
SQL> startup


Or check your database server if it is up and running in open mode.


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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