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

Oracle Error Tips by Donald Burleson


I have Oracle 9i installed on my local Windows XP workstation that will be used for local development only.  Now I am trying to create a database and using OEM Database Configuration Assistant.

I put in FirstDB for the Global Database Name and put in FirstDB for the SID.

I completed the wizard and set up my tnsnames.ora file with the SID and hostname. Then I tried to connect using OEM with the Sys login and it says:
ORA-12545:Connect failed because target host or object does not exist.

Should I put in localhost or for my Global Database Name?

I assume I connect as Sys or System and the password I created right after creating the database.

Please advise on how I can get this to work?

Answer:  Use oerr to look up the ORA-12545 error:

ORA-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.

I would start to debug a ORA-12545 error with these steps:

  • making sure that your listener is running (lsnrctl stat)
  • verifying connectivity via the DNS (e.g. /etc/hosts)
  • make sure to check your tnsnames.ora parms.

Also see MOSC notes ( on the ORA-12545 error:

  • Note 284909.1  - Intermittent ORA-12545 When Trying To Connect To RAC Database

  •  Note 364855.1 - RAC Connection Redirected To Wrong Host/IP ORA-12545

  • Note 291175.1 - Clients Failing to Connect Due to Intermittent ORA-12545 in RAC Environment

  • Note 333159.1 - ORA-12545 Frequent Client Connection Failure - 10g Standard RAC

Here is a helpful link to offer more information on troubleshooting connectivity errors.



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