We recommend considering firewalls to avoid anonymous client calls reaching physical machine on other, non-relevant ports, and to reduce the security risk. Windows based firewall is a built-in software firewall solution, that allows configuration of port-based traffic from within the operating system. On a standalone physical server or on any server without a hardware firewall connected to it, the Windows firewall will provide a level of protection against network-based attacks by limiting the attack surface only to the open, unblocked ports. A hardware-based firewall is a professional and recommended solution that allows the server to perform the main computation tasks and actively offloading the server from handling the network traffic. Both solutions can be used to restrict the network traffic only to the allowed pathways. Finally, the virtual network adapters used to connect the virtual switch must have appropriate security settings and limits applied.