I cannot control a turtle spawned in another machine.

edit

Thank you. I can connect to roscore from machine #2. But, another problem.

I would like to control turtle (turtlesim example) in #1 using #2 keyboard.

So in #1,

$ rosrun turtlesim turtlesim_node

And in #2,

$ rosrun turtlesim turtle_teleop_key

However, I couldn't control. And I also ran the 'rxgraph' util, it seems not connected.

What's the problem?

Here's my roswtf result. I confirmed that, I can connect to machine #1 via 11311 port by using netcat utility

hyon-no2@hyon-no2-desktop:~$ roswtf
Loaded plugin tf.tfwtf
No package or stack in context
================================================================================
Static checks summary:

No errors or warnings
================================================================================
Beginning tests of your ROS graph. These may take awhile...
analyzing graph...
... done analyzing graph
running graph rules...
connection to [/rosout] timed out
... done running graph rules

Online checks summary:

Found 2 error(s).

ERROR Could not contact the following nodes:
 * /rosout

ERROR Errors connecting to the following services:
 * service [/rosout/set_logger_level] appears to be malfunctioning: Unable to communicate with service [/rosout/set_logger_level], address [rosrpc://hyon-no1-desktop:35930]
 * service [/rosout/get_loggers] appears to be malfunctioning: Unable to communicate with service [/rosout/get_loggers], address [rosrpc://hyon-no1-desktop:35930]