The services are running for Agent, but it appears as Inactive in the Workload Automation DE Desktop Client Topology. An attempt to restart the agent did not resolve the issue.
The following error was evident in the agent log file:
The conversation aa.bbb.cc.ddd:51770->aa.bbb.cc.dd:7520 is unable to receive the prefix. The exception is Read timed out
A large number of spool files; in excess of 100,000, existed under the agent.