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I just ran into the same issue too, in the same tutorial, while using Fuerte on a fresh Ubuntu-12.04, 64-bit.
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" started working and gave me: ... contacting node http://localhost:60372/ ... Pid: 6178
I thought it was strange to see a different port number, but rosnode list started working too.
Then I went to the next tutorial and did "roscore" while other roscore was running.
Then I noticed that "rosnode list" again doesn't remove killed nodes and "rosnode info turtlesim" now gives: contacting node http://localhost:39889/ ... ERROR: Communication with node[http://localhost:39889/] failed!
Is the port number is not being set?
Seugen, did you file a bug for this?
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