Agent communication error: "Error sending message: NAK"
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Agent communication error: "Error sending message: NAK"


Article ID: 215027


Updated On:


Workload Automation Agent CA Workload Automation AE - System Agent (AutoSys) CA Workload Automation DE - System Agent (dSeries)


We have an agent that has been running, working and submitting jobs for quite some time.  All of a sudden the agent communication stopped working and all we can see is an error message in the transmitter log but not really sure what it means.

cybermation.library.communications.CybConversationException: Error sending message: NAK




Release : 11.x, 12.x

Component : CA Workload Automation System Agent


The error means agent is unable to send a 'NAK' to the scheduler to acknowledge that a message was received by the agent.

Possible causes are;

- network

- ports

- invalid manager / address.


The scheduling manager address is invalid in agent's agentparm.txt file.

Update the address (communication.manageraddress_<n> parameter) in agentparm.txt file.

Restart the agent for the change to take effect.