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Are you running ROS on multiple machines? Probably this might be a network problem. See ROS network setup for more information. Also, check your bashrc file and see whether it is properly configured for your ip.

For example:

export ROS_HOSTNAME=136.159.101.186 
export ROS_MASTER_URI=http://136.159.101.186:11311

Are you running ROS on multiple machines? Probably this might be a network problem. See ROS network setup for more information. Also, check your bashrc file and see whether it is properly configured for your ip.

Check you host name using

sudo nano /etc/hosts

For example:

export ROS_HOSTNAME=136.159.101.186 
export ROS_MASTER_URI=http://136.159.101.186:11311