How can I configure the Windows Server 2003 Service Pack 1 (SP1) Windows Firewall from a command line?

A. Windows 2003 SP1 improves the Netsh command to let you specify the "firewall" argument to access the firewall configuration. Netsh lets you

  • configure the default state of Windows Firewall (Off, On, On with no exceptions)
  • configure which exceptions should be enabled, including the scope of each exception and whether exceptions are enabled on all interfaces or per-interface
  • configure logging options
  • configure the Internet Control Message Protocol (ICMP) handling options
  • manage the exceptions list
For example, to enable the firewall, use the command
netsh firewall set opmode enable
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