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Solved: I found the issue, the problem with here

On my remote PC:

export ROS_MASTER_URI=http://robot.mydomain.mz:11311
export ROS_HOSTNAME=robot.mydomain.mz

While it should be:

export ROS_MASTER_URI=http://robot.mydomain.mz:11311
export ROS_HOSTNAME=<Remote PC>

Same as in this Tutorial : http://wiki.ros.org/turtlebot/Tutorials/indigo/Network%20Configuration On Remote PC "ROS_HOSTNAME=IP_OF_PC" Not the IP of robot machine

> echo export ROS_MASTER_URI=http://IP_OF_TURTLEBOT:11311 >> ~/.bashrc
> echo export ROS_HOSTNAME=IP_OF_PC >> ~/.bashrc

Although most of tools works fine (e.g rosrun / rostopic list ,...) , but setting ROS_HOSTNAME=IP_OF_PC, what maks roslaunch works fine!!

Solved: I found the issue, the problem with here

On my remote PC:

export ROS_MASTER_URI=http://robot.mydomain.mz:11311
export ROS_HOSTNAME=robot.mydomain.mz

While it should be:

export ROS_MASTER_URI=http://robot.mydomain.mz:11311
export ROS_HOSTNAME=<Remote PC>
PC IP>

Same as in this Tutorial : http://wiki.ros.org/turtlebot/Tutorials/indigo/Network%20Configuration On Remote PC "ROS_HOSTNAME=IP_OF_PC" Not the IP of robot machine

> echo export ROS_MASTER_URI=http://IP_OF_TURTLEBOT:11311 >> ~/.bashrc
> echo export ROS_HOSTNAME=IP_OF_PC >> ~/.bashrc

Although most of tools works fine (e.g rosrun / rostopic list ,...) , but setting ROS_HOSTNAME=IP_OF_PC, what maks roslaunch works fine!!