ORA-12545 connect failed because target host or object does not exist


You can get ” ORA-12545 connect failed because target host or object does not exist  ” error when connect to database via Toad or PLSQL Developer.

If you got ORA-12545 connect failed because target host or object does not exist error, 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.


Do you want to learn Oracle Database for Beginners, then read the following articles.


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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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