Re: [ros-users] Failed to contact the master at robot_name: …

:/echo $ROS_IP

:/echo $ROS_MASTER_URI
http://robot_name:11311

robot_name is tangm-desktop

I also use "roswtf", get a warnning:
WARNING Cannot resolve hostname in ROS_MASTER_URI
[http://robot_name:11311]Unknown host robot_name
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