Restart a service

Start the ssh service on all hosts:

Get-VMHost | Foreach {
   Start-VMHostService -HostService ($_ | Get-VMHostService | Where { $_.Key -eq "TSM-SSH"} )
}

Start the ssh service on a single host, change ESXiHostName to your ESXi FQDN:

Get-VMHost -Name ESXiHostName | Foreach {
   Start-VMHostService -HostService ( $_ | Get-VMHostService | Where { $_.Key -eq "TSM-SSH" } )
}

https://blog.vconsultants.be/start-stop-esxi-services-using-powercli/