Network ports and protocols for WinDiscovery and Masterclock applications

• UDP broadcast and multicast are often not routed. Many routers will not forward broadcast or multicast traffic across subnets without explicit configuration.
• Firewall policies frequently block UDP by default. Even when ICMP (ping) works, UDP traffic may be blocked.
• Security changes can break discovery without device changes. ACL, VLAN, and firewall updates can interrupt discovery and management tools unexpectedly.

• Discovery is required across VLANs, routed networks, or VPN connections
• Endpoint security or group policy controls the workstation firewall
• Discovery works on one PC but not another under the same network conditions

If you need exact port-level requirements for a specific Masterclock device or feature set, refer to the product documentation or contact Masterclock Support with your device model and firmware version.