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I am having a similar problem but I have put in the correct addresses (I believe):

Unable to contact my own server at [http://http:10.5.6.187:59339/]. Workstation IP = 10.5.6.93 TB IP = 10.5.6.187

I have dashboard up in Full mode with 0,1,2 all green.

WORKSTATION:~$ echo $ROS_MASTER_URI http://10.5.6.187:11311 WORKSTATION:~$ echo $ROS_HOSTNAME 10.5.6.93

turtlebot@turtlebot:~$ echo $ROS_MASTER_URI http://10.5.6.187:11311 turtlebot@turtlebot:~$ echo $ROS_HOSTNAME http:10.5.6.187

They can ping themselves no problem as well.

I am having a similar problem but I have put in the correct addresses (I believe):

Unable to contact my own server at [http://http:10.5.6.187:59339/]. Workstation IP = 10.5.6.93 TB IP = 10.5.6.187

I have dashboard up in Full mode with 0,1,2 all green.

WORKSTATION:~$ echo $ROS_MASTER_URI
http://10.5.6.187:11311
WORKSTATION:~$ echo $ROS_HOSTNAME
10.5.6.93
10.5.6.93
  
turtlebot@turtlebot:~$ echo $ROS_MASTER_URI
http://10.5.6.187:11311
turtlebot@turtlebot:~$ echo $ROS_HOSTNAME
http:10.5.6.187http:10.5.6.187