How to fix the Oracle error CRS-02403: The Cluster Time Synchronization Service on host string is in observer mode.?

In this post, you’ll learn more about the Oracle ErrorCRS-02403: The Cluster Time Synchronization Service on host string is in observer mode. with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

CRS-02403: The Cluster Time Synchronization Service on host string is in observer mode.

Reason for the Error CRS-02403: The Cluster Time Synchronization Service on host string is in observer mode.

Cause: The Cluster Time Synchronization Service detected an active vendor time synchronization service on at least one node in the cluster.

How to fix the Error CRS-02403: The Cluster Time Synchronization Service on host string is in observer mode. ?

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

Action: Oracle Clusterware requires a time synchronization service in active mode. Oracle Clusterware will work with a vendor service or the Cluster Time Synchronization Service. If you want to change the Cluster Time Synchronization Service to active mode, stop and deconfigure the vendor time synchronization service on all nodes.