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My project was compiling and executing, but I get an error now. I'm not sitting at my desk right now, but I think it said "Incorrect parameters" when I examine the error. Here's the offending code: boost::asio::io_service io_service; using boost::asio::ip::udp; udp::socket s(io_service, udp::endpoint(udp::v4(), 0)); udp::resolver resolver(io_service); udp::resolver::query query(udp::v4(), "127.0.0.1", 606); try { udp::resolver::iterator iterator = resolver.resolve(query); s.send_to(boost::asio::buffer(buffer, size), *iterator); } catch ( std::exception& e ) { std::cout << e.what() << std::endl; } The first line in the try block is what causes the exception. I thought I backed out all my changes, but I still can't get it to work. Can somebody tell me what obvious dumb mistake I made?