Unable to attach new agent to deployment target

Products

• CA Automic Workload Automation - Automation Engine

Issue/Introduction

Affects Release version(s): 6

Error Message :
System.ArgumentException: An item with the same key has already been added.

Under a specific condition it is not possible to add an agent to a deployment. If this happens the log.txt located in the webui directory of ARA will include information of why this happens. In this case the following is seen in the log file:

2017-10-24 23:59:05,807 [457(UC4/500)] ERROR RM.PeriodicTasks - Error processing periodic task 'AgentTracker' 
System.ArgumentException: An item with the same key has already been added. 

Environment

Release:
Component: ARLSMG

Cause

Cause type:
Other
Root Cause: N/A

Resolution

Please enable the following trace and send this information to Automic Support:

To enable debug level in ARA log, please go to [ARA web ui folder]/config/log4net.config:

change <level value="INFO" /> 
to <level value="DEBUG"/> 
in section <root> 

To enable AE request/response in log file, please go to [ARA web ui folder]/customer.config 
change <add key="AutomationEngine.TraceLevel" value="0"/> 
to <add key="AutomationEngine.TraceLevel" value="9"/> 

Fix Status: No Fix

Additional Information

Workaround :
N/A