使用Jasmine JavaScript测试框架时出现连接问题

当我尝试使用“rake jasmine:ci”命令通过Selenium运行示例javascript规范时,在Ubuntu上使用jasmine有一个问题。当net/http尝试连接到运行Selenium的端口时,我将定期收到一个“连接被拒绝”错误。我得到的回溯开始的一个例子是:

Waiting for jasmine server on 44210...
jasmine server started.
Running: java -jar "/home/pete/.rvm/gems/ree-head/gems/selenium-rc-2.2.4/vendor/selenium-server.jar" -port 42168 > /dev/null
==> Waiting for Selenium RC server on port 42168... Ready!
/home/pete/.rvm/rubies/ree-head/lib/ruby/1.8/net/http.rb:560:in `initialize': Connection refused - connect(2) (Errno::ECONNREFUSED)
from /home/pete/.rvm/rubies/ree-head/lib/ruby/1.8/net/http.rb:560:in `open'
from /home/pete/.rvm/rubies/ree-head/lib/ruby/1.8/net/http.rb:560:in `connect'
from /home/pete/.rvm/rubies/ree-head/lib/ruby/1.8/timeout.rb:53:in `timeout'
from /home/pete/.rvm/rubies/ree-head/lib/ruby/1.8/timeout.rb:93:in `timeout'
from /home/pete/.rvm/rubies/ree-head/lib/ruby/1.8/net/http.rb:560:in `connect'
from /home/pete/.rvm/rubies/ree-head/lib/ruby/1.8/net/http.rb:553:in `do_start'

我试过在窗户上使用茉莉花,但似乎没有这个问题。正如我所说,这并不是每次我试图运行它时都会发生(每次它都选择不同的端口),但确实会发生很多。我有点搞不清楚为什么茉莉花会偶尔找到一些开放的端口,但却无法连接到这些端口。在配置方面,我是否可以做些什么来解决或解决这个问题?或者这是茉莉花的问题?

任何帮助或想法都会受到赞赏。