Guys, I have 2 problems:
1) I can't manage to use http://localhost/ more than 1 time: on the second try i get "Safari can't find the server" but http://127.0.0.1/ works OK.
2) I get 500 error when trying to reach hello.rb. Ruby is installed & .profile file with "PATH=$PATH:/opt/iphone/bin/" created in /private/var/root.