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Note this also works for Hyper-V Server R1 or R2
A quick and easy method to disable the Windows Firewall in server core is to use the following command
“netsh advfirewall set currentprofile state off”
I have had to do this in some situations to get the DPM (2007 or 2010) agent to install remotely for example.
Blog, Virtualization
windows 2008 r2