microsoft-hyper-v-windows-server-2008-firewall-icmp-enable-ping
netsh firewall set icmpsetting 8
or interactively netsh firewall ?
netsh advfirewall set currentprofile settings remotemanagement enable
cscript C:\Windows\System32\Scregedit.wsf /ar 0 //ENABLES remote desktop for administration
script C:\Windows\System32\Scregedit.wsf /ar /v //EXAMINE current settings
cscript C:\Windows\System32\Scregedit.wsf /cs 0 //REDUCE security to allow older rdp clients access
netsh advfirewall firewall set rule group="Remote Desktop" new enable=yes
(only one session at a time? as it locks out the local administrator)
sconfig.cmd //RETURN to the dos-like hyper v menu system