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Connection refused means that it couldn't establish any connection to the remote machine. There are a few common things that could cause this:

  • Incorrect IP address
  • SSH server isn't running
  • No network connection between computers (cable unplugged, wifi down, etc)

I would start by trying to ssh to the remote machine manually by running:

ssh xxxxx@10.1.xx.xx

Establish that SSH works with that command before you try to troubleshoot roslaunch further.