In my mackbook, when I try to connect to my rails application in office I can't , in the office there are some http proxy , and when I run my rails like this :

sudo rails s -p8080
=> Booting WEBrick
=> Rails 3.0.5 application starting in development on http://0.0.0.0:8080
=> Call with -d to detach
=> Ctrl-C to shutdown server
[2012-03-20 12:49:34] INFO  WEBrick 1.3.1
[2012-03-20 12:49:34] INFO  ruby 1.8.7 (2010-01-10) [universal-darwin11.0]
[2012-03-20 12:49:34] INFO  WEBrick::HTTPServer#start: pid=17439 port=8080

The local IP is :

en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
ether f8:1e:df:d8:8c:25 
inet6 fe80::fa1e:dfff:fed8:8c25%en1 prefixlen 64 scopeid 0x5 
inet 10.21.21.240 netmask 0xffffff00 broadcast 10.21.21.255
media: autoselect
status: active

so when I try in the browser to trigger localhost:8080 or 10.21.21.240:8080 , it seems that I can't trigger my application

as for the proxy check out the following :

Any Ideas ?