Trying to install Ruby on Rails on OSX and I get Gem :: RemoteSourceException

Question

What happens when I get this "HTTP Response 403" error?

I am trying to configure Ruby on Rails on OS X 10.5.8 using Xcode 3.1.4:

Boston:$ ruby --version
ruby 1.8.6 (2008-08-11 patchlevel 287) [universal-darwin9.0]
Boston:$ gem --version
1.0.1

Boston:$ sudo gem update --system
Password:
Updating RubyGems...
ERROR:  While executing gem ... (Gem::RemoteSourceException)
    HTTP Response 403 fetching http://gems.rubyforge.org/yaml

Boston:$ sudo gem install rubygems-update
ERROR:  While executing gem ... (Gem::RemoteSourceException)
    HTTP Response 403 fetching http://gems.rubyforge.org/yaml

I cannot find one specific link online for error 403 in OS X. I tried to add alternative source repositories and I get the same error.

---

Solution based on @Phil's answer

I downloaded rubygems-1.3.5.zip from http://rubyforge.org/frs/?group_id=126 and unzipped the file.

Then I cd'd to the rubygems-1.3.5 directory and ran

 Boston:rubygems-1.3.5$ sudo ruby setup.rb
 RubyGems 1.3.5 installed

Thanks @Phil!

Answer 1

. , gemcutter rubygems ( , Leopard).

, rubygems http://rubyforge.org/frs/?group_id=126.