Can't register External connector server on vApp

Document ID : KB000112265
Last Modified Date : 30/08/2018
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Question:
After installing external connector server on windows machine, I try to register external connector server (ccs connector) to Vapp server at External Tools screen.
But it fails to register and show error message "Error fetching list of registered connector servers: Script terminated due to SSH command timeout running command on host " on webui screen and "ca_vapp_main.log" is like that

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yyyy MMM DD hh:mm:ss [hostname] ListRegisteredExternalConnectorServers Script started
yyyy MMM DD hh:mm:ss [hostname] ListRegisteredExternalConnectorServers [ERROR] Error fetching list of registered connector servers (error #124)
yyyy MMM DD hh:mm:ss [hostname] ListRegisteredExternalConnectorServers Script terminated due to SSH command timeout running command on host xxx.xxx.xxx.xxx
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Environment:
CA Identity Manager Virtual appliance
Answer:
Please restart JCS service on vApp machine by 'restart_jcs' command.