/gazebo/set_physics_properties question (be resolved)

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Hi All:

After Ros Installation, run: roslaunch gazebo_ros empty_world.launch

terminal info:

setting /run_id to 035b34fe-5738-11e7-8b85-c8ff280e1705
process[rosout-1]: started with pid [5634]
started core service [/rosout]
process[gazebo-2]: started with pid [5641]
process[gazebo_gui-3]: started with pid [5656]
[ INFO] [1498128374.802678518]: Finished loading Gazebo ROS API Plugin.
[ INFO] [1498128374.802975494]: waitForService: Service [/gazebo/set_physics_properties] has not been advertised, waiting...

It does not run ...just waiting.....

Running Ros kinetic under Ubuntu 16.04 LTS

How to fix it?

Thanks.

update: when I disconnect the wifi, it shows different info:

[ INFO] [1498151738.878216601]: Finished loading Gazebo ROS API Plugin.
[ INFO] [1498151738.878562714]: waitForService: Service [/gazebo/set_physics_properties] has not been advertised, waiting...
Error [parser.cc:581] Unable to find uri[model://sun]
Error [parser.cc:581] Unable to find uri[model://ground_plane]
[ INFO] [1498151739.745098328, 0.021000000]: waitForService: Service [/gazebo/set_physics_properties] is now available.
[ INFO] [1498151739.768749482, 0.044000000]: Physics dynamic reconfigure ready.