Scheduled Workflows Intermittently Fail to Start with "NotAuthorizedException" or "error" in Aria Orchestrator

Products

• VCF Automation
• VCF Operations/Automation (formerly VMware Aria Suite)

Issue/Introduction

Scheduled workflows in Aria Orchestrator intermittently fail to execute.

When this issue occurs, the following warning and error messages are logged in the Aria Orchestrator log file located at /prelude/vco-app/file-logs/vco-server-app.log:

WARN vco [host='vco-app-xxxxxxx-xxxxx' thread='CustomThreadPool's Thread-1' user='' org='' trace=''] {} com.vmware.o11n.service.tasks.TaskRunner - Unable to execute workflow from task
ch.dunes.util.NotAuthorizedException: User 'xxxxxxxx - yyyyyy\xxxxxx' doesn't have rights to execute the workflow
at com.vmware.o11n.service.impl.WorkflowRuntimeServiceImpl.executeWorkflowSecurityCheck(WorkflowRuntimeServiceImpl.java:321) ~[o11n-services-server-8.18.1.jar:?]

INFO vco [host='vco-app-8447c86848-bb5hz' thread='CustomThreadPool's Thread-1' user='' org='' trace=''] {} com.vmware.o11n.service.tasks.TaskCenter - Removing task '################' to schedule
2026-07-23T17:03:46.318Z WARN vco [host='vco-app-xxxxxxx-xxxxx' thread='http-nio-8280-exec-222' user='vro-gateway-xxxxxxx' org='-' trace='-'] {} org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver - Resolved [org.springframework.web.context.request.async.AsyncRequestNotUsableException: ServletOutputStream failed to write: java.io.IOException: Broken pipe]

 

Environment

Aria Automation 8.18.x | Aria Orchestrator 8.18.x

VCF Automation 9.x | VCF Operation Orchestrator 9.x

Cause

This occurs due to the premature expiration of authentication tokens, which leads to authorization failures when the scheduled task attempts to run

Resolution

This issue is resolved in the following releases:

VMware Aria Automation 8.18.1 Patch 2
VMware Cloud Foundation (VCF) 9.0.1

To resolve this issue, upgrade or apply the appropriate patch. 
A fix for the 9.1 release stream is planned for an upcoming release.