From: Luis Lavena <luislavena@...>
Date: 2009-12-08T11:40:34+09:00
Subject: Re: WEBrick doesn't work (permission/port error)

On Dec 7, 6:34 pm, "P. A." <shama...@hotmail.com> wrote:
> Hi.
>
> I get an error when I start a WEBrick server.
>
> Here's my application.
>
> # server.rb
> # encoding: utf-8
>
> require 'webrick'
>
> class Server
>   class << self
>     def start(config = {})
>       config.merge(:BindAddress => '0.0.0.0', :Port => 4321)
>       server = WEBrick::HTTPServer.new(config)
>       trap('INT') { server.shutdown }
>     end
>   end
> end
>
> Server.start
>
> $ ruby1.9.2dev server.rb
> [2009-12-08 00:21:53] INFO  WEBrick 1.3.1
> [2009-12-08 00:21:53] INFO  ruby 1.9.2 (2009-11-14) [i686-linux]
> [2009-12-08 00:21:58] WARN  TCPServer Error: Permission denied - bind(2)
> [2009-12-08 00:21:58] WARN  TCPServer Error: Permission denied - bind(2)
> /opt/ruby-1.9.2-dev/lib/ruby/1.9.1/webrick/utils.rb:73:in `initialize':
> Permission denied - bind(2) (Errno::EACCES)
>         from /opt/ruby-1.9.2-dev/lib/ruby/1.9.1/webrick/utils.rb:73:in
> `new'
>         from /opt/ruby-1.9.2-dev/lib/ruby/1.9.1/webrick/utils.rb:73:in
> `block in create_listeners'
>         from /opt/ruby-1.9.2-dev/lib/ruby/1.9.1/webrick/utils.rb:70:in
> `each'
>         from /opt/ruby-1.9.2-dev/lib/ruby/1.9.1/webrick/utils.rb:70:in
> `create_listeners'
>         from /opt/ruby-1.9.2-dev/lib/ruby/1.9.1/webrick/server.rb:74:in
> `listen'
>         from /opt/ruby-1.9.2-dev/lib/ruby/1.9.1/webrick/server.rb:62:in
> `initialize'
>         from
> /opt/ruby-1.9.2-dev/lib/ruby/1.9.1/webrick/httpserver.rb:24:in
> `initialize'
>         from server.rb:24:in `new'
>         from server.rb:24:in `start'
>         from server.rb:31:in `<main>'
>
> When I start it as a root I get another error.
>
> # ruby1.9.2dev server.rb
> [2009-12-08 00:26:18] INFO  WEBrick 1.3.1
> [2009-12-08 00:26:18] INFO  ruby 1.9.2 (2009-11-14) [i686-linux]
> [2009-12-08 00:26:23] WARN  TCPServer Error: Address already in use -
> bind(2)
>
> I also get these errors while I use a stable version of Ruby (1.9.1). I
> haven't got any other applications working on port 4321.
>
> Debian GNU/Linux 5.0.3;
> Ruby 1.9.1, 1.9.2dev;
> WEBrick 1.3.1.
>
> What is the reason of this bug?
>

Is not a bug, it clearly indicates that another process/server is
already bound to that port.

Please verify that your script wasn't running in the background or you
using a port that is already in use by other program/service.

--
Luis Lavena