From: Adam Majer <redmine@...>
Date: 2010-09-05T04:22:49+09:00
Subject: [ruby-core:32055] [Ruby 1.8-Bug#3787][Open] TCPSocket.new() fails on IPv6 connections for IPV4/IPv6 hosts

Bug #3787: TCPSocket.new() fails on IPv6 connections for IPV4/IPv6 hosts
http://redmine.ruby-lang.org/issues/show/3787

Author: Adam Majer
Status: Open, Priority: Normal
Category: core
ruby -v: ruby 1.9.1p378 (2010-01-10 revision 26273) [x86_64-linux]

$ host localhost
localhost has address 127.0.0.1
localhost has IPv6 address ::1

-----
server setup is just listening to ::1 address,

require 'socket'
s = TCPServer.new( '::1', 1200 )
s.accept

----
then I try to connect to this with client socket,

irb(main):001:0> require 'socket'
=> true
irb(main):002:0> TCPSocket.new( 'localhost', 1200 )
Errno::ECONNREFUSED: Connection refused - connect(2)
        from (irb):2:in `initialize'
        from (irb):2:in `new'
        from (irb):2
        from :0
irb(main):003:0> TCPSocket.new( '::1', 1200 )
=> #<TCPSocket:0x7f54d1c0aeb8>


Clearly, the 'localhost' should try to iterate through the addresses until it can connect, not fail. Python works correctly. telnet as well,

$ telnet localhost 1200
Trying ::1...
Connected to localhost.


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