As a first step, I would suggest checking your authorized_keys setup and 
make sure that you can login to the remote machine without password. A 
hypothesis is that you don't have an offending key for localhost, thus 
allowing the example to work on one machine, but you don't have the 
appropriate key deployed on the remote hosts that you are trying to use for 
the example. 
--Wayne Iba

On Thursday, April 26, 2018 at 10:42:36 AM UTC-7, Sumit Chaturvedi wrote:
> Hello! 
> For me the opposite problem is occurring. I get socket error while trying 
> to connect to a remote host but not for a local host. I specify the remote 
> hostname by replacing the "localhost" in the example by 
> "pra...@xx.xx.xx.xx". Is this format correct?? 

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