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Apparently I had set the ROS_HOSTNAME to the name of my ros_master instead of the name of my local machine. So for this to work we need to set the ROS_HOSTNAME to the name of the local machine ( in /etc/hosts) or its IP, set the ROS_IP to the ip of the local machine and ROS_MASTEr_URI to the ip of the master.

Apparently I had set the ROS_HOSTNAME to the name of my ros_master instead of the name of my local machine. So for this to work we need to set the ROS_HOSTNAME to the name of the local machine ( in /etc/hosts) or its IP, set the ROS_IP to the ip of the local machine and ROS_MASTEr_URI ROS_MASTER_URI to the ip of the master.