Hi Alexis,

For some reason 'localhost' isn't resolving on your machine. I would recommend trying using

ROS_IP=127.0.0.1

instead of ROS_HOSTNAME=localhost. NOTE: this will disable your ability to connect to remote machines with ROS.

 - Ken

On Mon, May 10, 2010 at 3:09 PM, Alexis Cheng <acheng_1221@hotmail.com> wrote:
Hi all,
 
I have installed ROS on a single Ubuntu machine and it seems to be working while connected to the internet. However, roscore is unable to run without internet connection. Roswtf does not return any errors or warnings.
 
-----
 
Roscore responds with:
 
[ERROR] 1273528178.429037000: [registerService] Failed to contact master at [localhost:11311]. Retrying...
 
Rosrun responds with:
 
Couldn't find an AF_INET address for [localhost]
[ERROR] 1273528740.753778000: [registerPublisher] Failed to contact master at [localhost:11311]. Retrying...
 
-----
 
I have went through the network setup document on ROS wiki and it seems to pass the tests. I have also changed ROS_HOSTNAME to localhost.
 
Has anyone encountered this problem before and managed to correct it?
 
Thanks!
 
Alexis Cheng
Electrical Engineering
University of British Columbia
 

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