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When GNS3 server is configured to listen on 0.0.0.0 (all interfaces), _server_url() was hardcoding 127.0.0.1, making the WebSocket console URL unreachable from remote MCP clients. Use the UDP connect trick (connect to 8.8.8.8:80 without sending data) to discover the default route interface IP, which is the address remote clients can actually reach.