# Socket programming in Ruby

**URL:** <https://www.ruby-forum.com/t/socket-programming-in-ruby/189915>\
**Category:** Ruby\
**Created:** [June 9, 2010, 9:58pm UTC](https://www.ruby-forum.com/t/socket-programming-in-ruby/189915 "2010-06-09T21:58:43Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dewie](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/ac8455/32.png) [@dewie](https://www.ruby-forum.com/u/dewie)\
**Post date:** [June 9, 2010, 9:58pm UTC](https://www.ruby-forum.com/t/socket-programming-in-ruby/189915/1 "2010-06-09T21:58:43Z")

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What are the requirements for the IP address passed to TCPSocket.new?  
Example…

> > require ‘socket’  
> > =\> true
> 
> > s = TCPSocket.new ‘127.0.0.1’, 6500  
> > Errno::ECONNREFUSED: Connection refused - connect(2)  
> > from (irb):2:in `initialize' from (irb):2:in`new’  
> > from (irb):2

In other words, what relationship does the machine on which the Ruby  
code is being run have with the IP address referenced in the code?

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<div class="post-metadata">

**Author:** ![dewie](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/ac8455/32.png) [@dewie](https://www.ruby-forum.com/u/dewie)\
**Post date:** [June 9, 2010, 10:07pm UTC](https://www.ruby-forum.com/t/socket-programming-in-ruby/189915/2 "2010-06-09T22:07:53Z")

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Never mind – turns out you have to create a TCPServer first.