[Boost-users] udp::endpoint listen_endpoint invalid argument

Hi, I built doc/html/boost_asio/example/timeouts/blocking_udp_client.cpp on Debian Jessie, but when I run it, I got Invalid argument on the statement of udp::endpoint listen_endpoint( boost::asio::ip::address::from_string(argv[1]), std::atoi(argv[2])); To simplify it, I changed to: udp::endpoint listen_endpoint( boost::asio::ip::address::from_string("localhost"), 15555); Appreciate any clues what's wrong with that statement and why it caused invalid argument? Thank you.