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Let me quote your question:

I have USARSim running on windows7 on a desktop and P3AT is loaded using Iridium. In my laptop I have ROS installed and through a LAN wire I try to connect to both machines. I type follow commands in my laptop which are given below:

  1. roscore

  2. roslaunch usarsim_inf usarsim.launch

[ERROR] [1380608092.814131851]: can't open socket to localhost port 3000

Then you are trying to connect to localhost, whereas you should try to connect to the computer running windows 7 and USARSim.

Solution: replace the string localhost on the second line with the IP address (or the name) of the computer where USARSim is running