Internet TCP port 411 is primarily used by Direct Connect, a peer-to-peer file sharing protocol. Direct Connect clients, such as DC++ and StrongDC++, use this port for client-to-client connections and search functionality. Additionally, the port is used by the Gnutella network for server connections. It's important to note that the usage of this port can vary, as it's not officially registered to any specific service by the Internet Assigned Numbers Authority (IANA).
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