To configure the FIREWALL on the windows SERVER CORE:
Use the following command.
For example, to enable remote management from any MMC snap-in, type the following:
netsh advfirewall firewall set rule group="Remote Administration" new enable=yes
Notes: You can also use the Windows Firewall snap-in from a computer running Windows Vista or Windows Server 2008 to remotely manage the firewall on a server running a Server Core installation. To do this, you must first enable remote management of the firewall by running the following command on the computer running a Server Core installation:
netsh advfirewall set currentprofile settings remotemanagement enable