Data Aggregator port 8581 "Connection Refused" to download Data Collector installer file

Products

• Network Observability
• CA Performance Management

Issue/Introduction

After upgrading DX NetOps Performance Management to version 25.4.7:

• Attempts to download the Data Collector (DC) installer via wget or curl on port 8581 fail with: failed: Connection refused.
• The dadaemon service status shows as active (running), but the Data Aggregator (DA) does not respond to requests.
• The NetOps Portal System Health view shows the Data Aggregator, Data Collector, and Data Repository as Failed.
• The netops-data-aggregator.logcontains the following error:

  org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'alarmSchemaManager': Invocation of init method failed Caused by: java.sql.SQLSyntaxErrorException: [Vertica][VJDBC](6999) ERROR: The library [VFunctionsLib] for the function [LISTAGG(varchar)] was compiled with an incompatible SDK Version [24.2.0]

Environment

• Product: DX NetOps Performance Management
• Component: Data Aggregator, Data Repository (Vertica)
• Version: Upgraded to 25.4.7

Cause

DX NetOps Performance Management 25.4.7 requires Vertica version 25.3.0-8. If the Data Repository (Vertica) is on an older version (such as 24.4.0-5 or 24.2.0), the Data Aggregator fails to initialize because it cannot load the required SQL functions from the database. This prevents the DA from opening its listening ports (8581/8582), even though the process is running.

Resolution

1. Upgrade the Data Repository: Verify the current Vertica version. If it is below 25.3.0-8, perform an upgrade of the Data Repository as per the official 25.4.7 installation/upgrade documentation.
2. Restart Services: Once the database is upgraded, restart the Data Aggregator service: systemctl restart dadaemon