ADR Vault became active due to a failure of the primary Vault.

Shut down the PrivateArk Server Service on the DR Vault.

In the PADR.ini file, set Failover Mode = No and remove the last two lines.

Start the PrivateArk Disaster Recovery Service.

Comprehensive Explanation: When the primary Vault service has been restored and you need to return the DR Vault to its normal standby mode, the steps are as follows:

Shut down the PrivateArk Server Service on the DR Vault to stop the Vault from being active.

Modify the PADR.ini file by setting Failover Mode to No and removing the last two lines that were added during the failover process. This reconfigures the DR Vault to standby mode.

Start the PrivateArk Disaster Recovery Service to complete the transition back to standby mode1.

References:

CyberArk Docs - Initiate a DR Failback to the Production Vault1