How to fix the Oracle error ORA-29701: unable to connect to Cluster Synchronization Service?

In this post, you’ll learn more about the Oracle ErrorORA-29701: unable to connect to Cluster Synchronization Service with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-29701: unable to connect to Cluster Synchronization Service

Reason for the Error ORA-29701: unable to connect to Cluster Synchronization Service

Connect to CSS failed or timed out.

How to fix the Error ORA-29701: unable to connect to Cluster Synchronization Service ?

You can fix this error in Oracle by following the below steps

Verify the state of the CSS. If the CSS was not started, start it and then retry the database startup. If the CSS died or is not responding, check the Oracle and CSS trace files for errors and contact Oracle Support Services.