Data Aggregator Renders Error 500 when Accessing REST api

Products

• Network Observability
• CA Performance Management

Issue/Introduction

Users encounter an HTTP Error 500 when attempting to access the Data Aggregator Rest API. While the dadaemon service is active and the Data Aggregator port is available, the interface remains inaccessible.

Environment

 

• Product: DX NetOps Network Observability
• Version: 24.3.13
• OS: Linux

 

Cause

The Data Aggregator cannot correctly resolve the hostname or IP address of the Portal. This failure in name resolution prevents the DA from communicating effectively with the portal interface, resulting in a 500-level server error.

Resolution

To resolve this issue, ensure proper name resolution between the Data Aggregator and the Portal:

1. Verify Connectivity: Log into the Data Aggregator host and run the following commands to test resolution for the Portal host:
   • getent hosts <Portal_Hostname>
   • nslookup <Portal_Hostname>
   • ping -c 4 <Portal_Hostname>
2. Check Configuration Files: Inspect the /etc/hosts file on both the Data Aggregator and DX NetOps Portal machines.
3. Correct Host Entries: Ensure that both the IP address and hostname (including FQDN) for the DA and the Portal are configured correctly in the hosts file or within your DNS environment.
4. Restart Services: If changes were made to the hosts file, verify if the DA URL becomes accessible. In some cases, a restart of the dadaemon may be required to pick up network configuration changes.