Unable to contact my own server

asked 2020-06-20 05:04:55 -0500

Giri
1 ●2 ●4 ●2

updated 2020-06-20 08:01:00 -0500

gvdhoorn
86574 ●283 ●1432 ●1054 http://cor.tudelft.nl/

Hi, I git coned a repository from https://github.com/ros-industrial/uni.... when I tried to roslaunch the U5 robotic arm I got the following error:

Unable to contact my own server at [http://user-devil:45261/].
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 user-devil

For more tips, please see

    http://www.ros.org/wiki/ROS/NetworkSetup

The traceback for the exception was written to the log file

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Comments

This error is not caused by the packages in the repository you've cloned.

It's a generic ROS error drawing attention to the fact that you've misconfigured your system.

Either your hostname isn't user-devil, you've hard-coded ROS_MASTER_URI to use that name, or you have a very strict firewall blocking all connections.