Ruby on Rails

Hello,

I've been trying to install and update different gems to work with Ruby
on Rails, but keep getting the same error, apparently indicating I can't
install or update any gem:

I generally type in something like:

gem update --system or gem install Rails --version 4.0.0 --no-ri
--no-rdoc

And get the following:

ERROR: While executing gem ... (Errno::EINVAL)
Invalid Argument - socket(2) - udp

Note that I've proceeded to the same setup just a couple of days before
on a different machine and had no problem.

I couldn't figure any place where this same Error was explained or
encoutered.

Anybody here can help out?

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