TNS-12528: TNS:listener: all appropriate instances are blocking new connections

Mehmet Salih Deveci

5 years ago

Hi,

Sometimes You can get “TNS-12528: TNS:listener: all appropriate instances are blocking new connections ” error.

Details of error are as follows.

TNS-12528: TNS:listener: all appropriate instances are blocking new connections

Cause: All instances supporting the service requested by the client reported that they were blocking the

new connections. This condition may be temporary, such as at instance startup.

Action: Attempt the connection again. If error persists, then contact the administrator to check the status of the instances.

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

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/