Alexis, Can you successfully ping localhost? What are the contents of /etc/hosts on your machine? Is there an entry such as "127.0.0.1 localhost"? - Eric On Mon, May 10, 2010 at 6:11 PM, Ken Conley wrote: > 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 > 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 >> >> >> ________________________________ >> 30 days of prizes: Hotmail makes your day easier! Enter now >> _______________________________________________ >> ros-users mailing list >> ros-users@code.ros.org >> https://code.ros.org/mailman/listinfo/ros-users >> > > > _______________________________________________ > ros-users mailing list > ros-users@code.ros.org > https://code.ros.org/mailman/listinfo/ros-users > >