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OS: Fedora 14 ROS: Fuerte

Error, while initializing roscore:

Unable to contact my own server at [http://scitos:50689/]. This usually means that the network is not configured properly.

A common cause is that the machine cannot ping itself. Please check for errors by running:

ping scitos

For more tips, please see


ping scitos delivers

unkown host scitos

ping localhost works fine, ping likewise

Solutions according to ros-wiki is to set

ROS_HOSTNAME=localhost ROS_MASTER_URI=http://localhost:11311

this has not worked ping $ROS_HOSTNAME does fine, while ping $ROS_MASTER_URI returns

unknown host http://localhost:11311

Any ideas why this does not work? Maybe some issue concerning my network connection(using wireless for internet, still there are two ethernet accesses, which are currently not used)?

thx :-)

Originally posted by Flowers on ROS Answers with karma: 342 on 2012-07-30

Post score: 0


1 Answer 1


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It's clear that you can't ping the ROS_MASTER_URI. Pinging the host in the ROS_MASTER_URI is the correct way.

Could you run a roscore after setting ROS_HOSTNAME?

The other way is checking your /etc/hosts. There should probably be a line like:   localhost

If you add   scitos

after that, you should be able to do ping scitos.

Originally posted by dornhege with karma: 31395 on 2012-07-30

This answer was ACCEPTED on the original site

Post score: 0


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