TNS-12545: Connect failed because target host or object does not exist

Mehmet Salih Deveci

5 years ago

Hi,

Sometimes You can get “TNS-12545: Connect failed because target host or object does not exist ” error.

Details of error are as follows.

TNS-12545: Connect failed because target host or object does not exist

Cause: The address specified is not valid, or the program being connected to does not exist.

Action: Ensure the ADDRESS parameters have been entered correctly; the most likely incorrect parameter is

the node name. Ensure that the executable for the server exists (perhaps “oracle” is missing.)

If the protocol is TCP/IP, edit the TNSNAMES.ORA file to change the host name to a numeric IP address and try again.

Sometimes you can get this error because of IP address, probably you used hostname or scan name instead of Public IP adress or Scan IP.

You can try in CMD using nslookup if your client will resolve hostname or not

nslookup hostname

nslookup SCAN-NAME

To solve this problem you need to change DNS Server and use same dns server with database server.

If you don’t change dns server then you should use Public IP or SCAN IP instead of hostname, SCAN Name.

Or you should check the host name with ip address in /etc/hosts/ , if it is correct or not.

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