ORA-12564: TNS connection refused

Hi,

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

Details of error are as follows.

ORA-12564: TNS:connection refused

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.

LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.63.34)(PORT = 1521))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
)

SID_LIST_LISTENER = 
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = MSDB)
(ORACLE_HOME = /u01/app/db_home_18c )
(SID_NAME = MSDB1 )
)
)

[oracle@msdbadm01 ~]$ lsnrctl start LISTENER

Or Restart database and listener.

LSNRCTL> stop
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.

https://ittutorial.org/rman-backup-restore-and-recovery-tutorials-for-beginners-in-the-oracle-database/