I am  new  here. 
I   install a  ros into  my computer (OS is fedora11) .
    When  i  run roscore ,i get this message . 


... logging to
/root/.ros/log/d2c97a1a-3563-11df-8e96-001bb9806e0a/roslaunch-robot-9093.log

Unable to contact my own XML-RPC server, this is a highly unusual error and
should be reported immediately.
My URI is [http://robot:38228/]
   I
my compute's name  is "robot". 
I have changed  the ROS_HOSTNAME=localhost

thanks for anyone'help


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