RubyMine 启动调试出错： permission denied



错误 信息：

=> Booting WEBrick
=> Rails 4.2.0 application starting in development on http://127.0.0.1:3000
=> Run `rails server -h` for more startup options
=> Ctrl-C to shutdown server
Exiting
[2015-04-21 21:47:36] INFO  WEBrick 1.3.1
[2015-04-21 21:47:36] INFO  ruby 2.1.5 (2014-11-13) [x64-mingw32]
C:/Ruby21-x64/lib/ruby/2.1.0/socket.rb:206:in `bind': Permission denied - bind(2) for 127.0.0.1:3000 (Errno::EACCES)
 from C:/Ruby21-x64/lib/ruby/2.1.0/socket.rb:206:in `listen'

改了个端口就对了。