http://magicalyak.org/2013/12/22/windows-2012-r2-core-firewall-rules/
http://fixmyitsystem.com/2012/11/windows-server-2012-core-management.html
For some reason the commands to open up the firewall for remote admin seem to be a bit difficult to find. If you are trying out Core, you have to set this up on the command line. Let me know if you have interest in more “general test lab setup” firewall rules.
This post wasn’t much help at first but F. Verstegan in the comments lists the commands I have below
http://technet.microsoft.com/en-us/library/jj647785.aspx
The commands below are to open the firewall for most remote admin functions (since you’re using core and testing it, you’re going to remote manage right?)
Start powershell
Enable-NetFirewallRule -DisplayGroup “Remote Volume Management”
Enable-NetFirewallRule -DisplayGroup “Windows Firewall Remote Management”
Enable-NetFirewallRule -DisplayGroup “Remote Scheduled Tasks Management”
Enable-NetFirewallRule -DisplayGroup “Remote Service Management”
Enable-NetFirewallRule -DisplayGroup “Remote Event Log Management”
Enable-NetFirewallRule -DisplayGroup “Windows Remote Management”
ii C:\Windows\System32\drivers\etc host
set-service vds -StartupType Automatic
Done.