我正在尝试用Ruby解析rss提要。这是我的（工作）代码，带有实际的提要网址：
include 'rss'
myfeed = RSS::Parser.parse('http://allmusicnews.altervista.org/blog/feed/', false)
如果我从开发计算机（Mac OS 10.9）运行它，一切正常。如果我从我的服务器（Debian 7）运行它，我得到的只是：
/home/daniele/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/net/http.rb:879:in `initialize': Connection refused - connect(2) for "allmusicnews.altervista.org" port 80 (Errno::ECONNREFUSED)
from /home/daniele/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/net/http.rb:879:in `open'
from /home/daniele/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/net/http.rb:879:in `block in connect'
from /home/daniele/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/timeout.rb:74:in `timeout'
from /home/daniele/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/net/http.rb:878:in `connect'
from /home/daniele/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/net/http.rb:863:in `do_start'
from /home/daniele/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/net/http.rb:852:in `start'
from /home/daniele/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/open-uri.rb:318:in `open_http'
from /home/daniele/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/open-uri.rb:736:in `buffer_open'
from /home/daniele/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/open-uri.rb:211:in `block in open_loop'
from /home/daniele/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/open-uri.rb:209:in `catch'
from /home/daniele/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/open-uri.rb:209:in `open_loop'
from /home/daniele/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/open-uri.rb:150:in `open_uri'
from /home/daniele/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/open-uri.rb:716:in `open'
from /home/daniele/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/open-uri.rb:724:in `read'
from /home/daniele/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/rss/parser.rb:103:in `normalize_rss'
from /home/daniele/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/rss/parser.rb:89:in `initialize'
from /home/daniele/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/rss/parser.rb:76:in `new'
from /home/daniele/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/rss/parser.rb:76:in `parse'
其他 rss 源不会发生这种情况。 示例：feeds.blogo.it/soundsblog/it 似乎在两个平台上都运行良好。
我使用相同的Ruby版本（2.2.0），在两台计算机上都安装了RVM。同样的宝石也是如此。
任何线索，至少关于要寻找什么？
ps：这似乎与连接超时有关，但是当我运行脚本时，我突然看到上面的错误消息，没有空闲等待时间......
请忽略我的问题。我射错了目标。
实际上，我担心我的生产机器会出现一些黑名单问题。我无法以任何方式连接到 altervista.org 服务器（lynx，telnet），我一直收到"连接被拒绝错误"，所以与我的Ruby代码无关...