When logging in vCenter HA witness node via ssh, "[ERROR]:failed to connect to service." displayed.
[ERROR]: Failed to connect to service.
Use service-control command to manage applmgmt service
* List APIs: "help api list"
* List Plugins: "help pi list"
* Launch BASH: "shell"
Command>
VMware vCenter Server
This is expected behavior since not all the services are executed on vCenter HA witness node.
SSH will be working fine, so just ignore the message.