Internet TCP port 5357 is primarily used by the Windows operating system for the Windows Network Discovery protocol. This protocol allows Windows machines to easily find and share resources, such as files and printers, with other devices on the same network. It is also used by the Web Services for Devices (WSD) API, which enables computers to discover, communicate, and perform services for network-connected devices. However, it's important to note that this port can be exploited for malicious purposes if not properly secured.
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