From: Caleb Clausen <vikkous@...>
Date: 2010-06-03T08:22:05+09:00
Subject: Re: TCPSocket error

On 6/2/10, Ted Pon <ted_pon@hotmail.com> wrote:
> Hi all,
>
> I am a student learning ruby and I am getting an error that I can't
> figure out. It works on my teacher's mac, however does not on my laptop.
>
> Windows Vista 64-bit
> My ruby version is: 1.9.1p378 (2010-01-10 revision 26273) [i386-mingw32]
>
>
> Here is what I've tried in cmd
>
> irb
>
> irb(main):002:0> require 'socket'
> => true
> irb(main):005:0> TCPSocket.open('0.0.0.0', 8888)
> Errno::EADDRNOTAVAIL: The requested address is not valid in its context.
> - conne
> ct(2)
>         from (irb):5:in `initialize'
>         from (irb):5:in `open'
>         from (irb):5
>         from C:/Ruby19/bin/irb:12:in `<main>'
>
> Any help would be appreciated!

Apparently, 0.0.0.0 is treated as a loopback address on the mac. Apple
got this wrong; that's a broadcast address and should be treated as
the same as 255.255.255.255. 127.0.0.1 is the canonical loopback
address, and that's what you should use for greatest portability.