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 <jack.oquin@gmail.com> wrote:

> On Sun, Jun 3, 2012 at 12:12 PM, Alex Bravo <robotatlas@gmail.com> 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
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