You are trying to manage a computer by using Server Manager on Windows Server 2012 R2. However encountered an error message
“Online-Verify WinRM 3.0 service installed, running, and required firewall ports are open”
after added new server.
[ Resolution ]
On the new computer that you would like to add, execute the following command in Powershell:
[ Final result ]
Click Refresh button on Server Manager. Problem resolved and you can manage your server from Server Manager.