Install personal firewall on devices that connect to the Internet outside of internal network, but also used to access the CDE
Portable computing devices that are allowed to connect to the Internet from outside the corporate firewall and then used to access the cardholder data environment (CDE) are more vulnerable to Internet-based threats. This PCI requirement mandates that personal (desktop) firewall must be installed on all portable devices used by employees to connect to the Internet outside of organization’s network, which are also used to access the CDE. This includes devices owned by organization and employees. This section requires specific firewall configuration settings to be defined, and also firewall must be active and restricted from reconfiguration (so users cannot alter its settings or deactivate it).
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