TNS-00534: Failed to grant connection ownership to child

You are having issue to bring up Oracle database in Windows environment. There is no error found in alert log. The listener is also running fine. But, in the Oracle listener log file, you have found below error,

TNS-00534: Failed to grant connection ownership to child

Solution

Open the Windows Services screen. Press “O” to filter all services that starts with O – Here, you will need to search both service named  Oracle<SID>TNSListener and OracleService<SID>.

Look out on Log On As tab and from here you will need to have the same user maintained. The error TNS-00534: Failed to grant connection ownership to child is occurred due to different user was maintained for both services. As below screenshot, both services are been executed by Local System.

If the user is different, then you can change it by double click on the service and change the user from Log On tab.