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Is there a way to locate a TCP Server running under local network using raw sockets and C#?
-The Client searching for the Server is running under the same local network as the Server and it knows the port the Server is running with.
-is it by Broadcast?
Yes it’s possible to do this with the Socket class if the server sends UDP broadcasts on a periodic basis or in response to a solicitation. The client would have to listen for UDP broadcasts and optionally send a solicitation to discover the server.
If you’re not strictly limited to the Socket class, have a look at DNS-SD / Zero configuration networking. This has been invented for the exact purpose of discovering services on a local network.