Remotely Disable a Windows Firewall (command line)

On a computer in the domain, hit Start, Run, Type:

runas /user:an-administrator@YourDomain cmd "CMD will start with domain admin privliges "

in the CMD window, run:
psxec \\yourremotecomputername cmd

Now run:
netsh firewall set opmode disable "To disable firewall"

Or if you have access to GPO you can do this in the GPO with a GPP

Download PSExec here:  http://technet.microsoft.com/en-us/sysinternals/bb897553.aspx