Never mind. I just found that somebody already asked about it a few days ago on answers.ros.org . :) On Sun, Jun 3, 2012 at 11:01 AM, Alex Bravo wrote: > Thanks Jack. I wasn't sure answers.ros.org was good for that. Posting > there right now. > > On Sun, Jun 3, 2012 at 10:37 AM, Jack O'Quin wrote: > >> On Sun, Jun 3, 2012 at 12:12 PM, Alex Bravo wrote: >> > I ran into an issue while doing "Understanding ROS Nodes" >> > tutorial >> http://www.ros.org/wiki/ROS/Tutorials/UnderstandingTopics#preview >> > >> > I noticed that killed ROS nodes are not being removed from "rosnode >> list". >> > >> > When I used "rosnode info turtlesim", I saw: >> > ... >> > contacting node http://i7:56977/ ... >> > ERROR: Communication with node[http://i7:56977/] failed! >> > >> > I thought maybe it was because I did not have $ROS_HOSTNAME defined as >> > described here: >> > http://www.ros.org/wiki/ROS/NetworkSetup#Single_machine_configuration >> > So I added export ROS_HOSTNAME=localhost >> > >> > After that "rosnode info turtlesim" give me: >> > ... >> > contacting node http://localhost:60372/ ... >> > Pid: 6178 >> > >> > I thought it was strange to see a different port number, but rosnode >> list >> > started working. >> > >> > Then I went to the next tutorial and did "roscore" while other roscore >> was >> > running. >> > >> > Then I noticed that "rosnode list" again doesn't work and "rosnode info >> > turtlesim" now gives: >> > contacting node http://localhost:39889/ ... >> > ERROR: Communication with node[http://localhost:39889/] failed! >> > >> > >> > P.S. I'm using Fuerte with a fresh Ubuntu-12.04, 64-bit. >> >> Alex, >> >> This is a good question for answers.ros.org. >> >> Please see: http://www.ros.org/wiki/Support >> -- >> joq >> _______________________________________________ >> ros-users mailing list >> ros-users@code.ros.org >> https://code.ros.org/mailman/listinfo/ros-users >> > >