There's been a recent move of gems to http://gemcutter.org/. The
RubyForge gems server is supposed to continue working, but if you want
to move, you can do the following.

sudo gem sources list
# lists all source servers

sudo gem sources -a http://gemcutter.org/
# adds gemcutter to sources

sudo gem sources -r http://gems.rubyforge.org/
# if you want to clean up the old source, then remove it

sudo gem update --system
# try the update again

On Fri, Nov 20, 2009 at 5:23 PM, Junmin Liu <junmin / pcbi.upenn.edu> wrote:
> i was trying to update the rubygem preinstalled in macos 10.5.7 by:sudo
> gem update --system or gem
> update --system.
>
> but i am getting this:
>
>> sudo gem update --system
> Updating RubyGems...
> ERROR: While executing gem ... (Gem::RemoteSourceException)
>  HTTP Response 403 fetching http://gems.rubyforge.org/yaml
>
> Any idea?
>
> my gem is 1.0.1, and ruby 1.8.6 (2008-08-11 patchlevel 287)
> [universal-darwin9.0]
> Thanks,
> --
> Posted via http://www.ruby-forum.com/.
>
>