Symptoms

A customer gets below errors:
Machine agent HTTP client returned an error status for action CREATE_EVENTS
Machine agent HTTP client returned an error status for action PING
/DVD/APPD_CL_HTTP_CLIENT======CP
HTTP communication failed
Connect to sapserver:8293 failed: NIECONN_REFUSED(-10))
HTTP response ended with error
Exception occurred in program name /DVD/APPD_CL_MACHINE_AGENT====CP
HTTP sap server (URI '/api/v1/events') responded with status code 404 (Connection Refused)

Datavard Insights - /DVD/MON

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/DVD/APPD_STATUS

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APPLICATION LOGS

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Reason and prerequisites

Errors occur because of:

• Machine Agent not installed
• Insights collectors are running and are collecting KPIs and table details
• Insights integration is triggered for replication KPIs like AppD metrics and records table details like AppD application events and Analytics events
• Metrics are sent via HTTP SDK, so if these are running, everything is OK
• Application events are still sent via Machine agent so if MA is installed or set up correctly, this error appears
• The only one option how to circumvent it is to turn off integration in /DVD/APPD_CC, but it also stops sending events and metrics

Solution

We recommend the customer to follow the guide: 
https://docs.appdynamics.com/display/PRO43/Start+and+Stop+the+Standalone+Machine+Agent this guide.

Here can be found how to download and set up the recommended version of Machine Agent: https://download.appdynamics.com/download/