How to fix the Oracle error TNS-01196: Listener failed to initialize valid node list?

In this post, you’ll learn more about the Oracle ErrorTNS-01196: Listener failed to initialize valid node list with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

TNS-01196: Listener failed to initialize valid node list

Reason for the Error TNS-01196: Listener failed to initialize valid node list

Cause: VNCR options are not properly initialized in listener.ora or OS API failed.

How to fix the Error TNS-01196: Listener failed to initialize valid node list ?

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

Action: Check VNCR options i.e. valid_node_checking_for_regisrtation, registration_invited_nodes, registation_excluded_nodes in listener.ora For further details, turn on tracing.