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 <
robotatlas@gmail.com> 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 <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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>> ros-users@code.ros.org
>> https://code.ros.org/mailman/listinfo/ros-users
>>
>
>
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