Microsoft Windows XP with installed service pack 2 offers firewall software too. In the control panel there is an icon called
Windows Firewall. Double-click on this icon.
Windows Firewall is activated as default, blocking all connections from outside to the local host. The Windows machine can connect to any host; even OpenVPN as a client can be run without any changes. If you want to connect to this Windows machine with OpenVPN, then some changes have to be made. The
Windows Firewall offers the possibility to switch off the firewall service completely (which should only be done for testing purposes) ...