cant-open-could-not-contact-ros-master-at
user@server:~$ rviz
[ INFO] [1711457974.411129714]: rviz version 1.14.20
[ INFO] [1711457974.411172314]: compiled against Qt version 5.12.8
[ INFO] [1711457974.411184184]: compiled against OGRE version 1.9.0 (Ghadamon)rviz error box:Could not contact ROS master at [http://localhost:11311], retrying... #37roscore shows:RLException: Unable to contact my own serverSolYour ROS_HOSTNAME env var is not correctly set.ref: https://answers.ros.org/question/301509/cant-run-roscore-unable-to-contact-my-own-server/Use output of hostname -I to set your ROS_MASTER_URI and ROS_HOSTNAME, like:export ROS_MASTER_URI=http://10.53.21.95:11311
export ROS_HOSTNAME=10.53.21.9