Hello.  I tried using the code provided here: http://www.boost.org/doc/libs/1_41_0/doc/html/boost_asio/example/echo/blocking_tcp_echo_server.cpp to echo text back to a client but i haven't been successful. It seems to hang at  size_t length = sock->read_some(boost::asio::buffer(data), error);  what is wrong? Thanks