After installing Windows Hyper-V 2012 sometimes there might be some issues with remote management (even if enabled via sconfig).
In that case few firewall rules might have to be enabled on Hyper-V machine using PowerShell:
enable-netfirewallrule -displaygroup "Hyper-V" enable-netfirewallrule -displaygroup "Windows Remote Management" enable-netfirewallrule -displaygroup "Remote Event Log Management"
Once these rules will be enabled should be no problem to connect to Hyper-V machine via Computer Management.