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Installing ruby on rails

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I need to install ruby on rails. I have installed ruby and it says to
type in gem install rails --remote. When i try this is what happens:
I get the message:

C:\>gem install rails --remote

C:\>"c:\ruby\bin\ruby.exe" "c:\ruby\bin\gem" install rails
Attempting local installation of 'rails'
Local gem file not found: rails*.gem
Attempting remote installation of 'rails'
Updating Gem source index for:
ERROR: While executing gem ... (Errno::EHOSTUNREACH)
A socket operation was attempted to an unreachable host. -

Could anyboy help??

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