Navigation:Navigate to Workflow Administrator> Oracle Application Manager > Workflow Manager > Service Components > Workflow Agent Listener Services

Start and Stop the Oracle Workflow Services

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There also is a script to check all workflow service status

SET PAGESIZE 400
SET LINESIZE 120
SET PAGESIZE 50
COLUMN COMPONENT_NAME FORMAT A45
COLUMN STARTUP_MODE FORMAT A15
COLUMN COMPONENT_STATUS FORMAT A15
SELECT FSC.COMPONENT_NAME,FSC.STARTUP_MODE,FSC.COMPONENT_STATUS
FROM APPS.FND_CONCURRENT_QUEUES_VL FCQ, FND_SVC_COMPONENTS FSC
WHERE FSC.CONCURRENT_QUEUE_ID = FCQ.CONCURRENT_QUEUE_ID(+)
ORDER BY COMPONENT_STATUS , STARTUP_MODE , COMPONENT_NAME;