AEM 6.5 SP21: New Error Response for Author Standby Instance
This article explains the change in error response on the AEM 6.5 author standby instance after installing Service Pack 21, where the error shifts from 503 to 404. You’ll learn how to verify the TarMK Coldstandby configuration and check key indicators to confirm a stable setup.
Description description
Environment
Adobe Experience Manager 6.5.21.0 (Service Pack 21)
Issue/Symptoms
When configuring TarMK Coldstandby in AEM, the Author Standby instance normally returns an error response. This article explains the change in error code when installing AEM 6.5 SP21
Resolution resolution
In the previous versions (AEM 6.5.20.0 or earlier), accessing the Author Standby instance resulted in a 503 error. In the updated version (AEM 6.5.21.0), after installing Service Pack 21, this error has changed to a 404. This is expected behavior.
To check the TarMK Coldstandby configuration status, follow these steps in the Standby instance’s OSGi Web Console under Main > JMX (http://localhost:port/system/console/jmx) > Standby Status:
- Ensure that the SecondsSinceLastSuccess value updates periodically.
- Confirm that FailedRequests is not continuously increasing.
- Verify that the tarmk-coldstandby.log does not repeatedly show errors.