Gem command works locally, not on remote machine

I'm having some trouble with the gem command. On my local MacBook Pro
the gem command works fine...

$ sudo gem outdated
Password:

....just returns nothing, as expected.

$ sudo gem update --system
Updating RubyGems
Nothing to update
$

On my CentOS 5 VPS I get a completely different response...

$ su -
# gem outdated
Bulk updating Gem source index for: http://gems.rubyforge.org

And it just stops there without returning to the command prompt. Same
deal with any gem subcommand I try.

Local gem environment:

- RUBYGEMS VERSION: 1.2.0
- RUBY VERSION: 1.8.6 (2007-03-13 patchlevel 0) [universal-
darwin8.0]
- INSTALLATION DIRECTORY: /usr/local/lib/ruby/gems/1.8
- RUBY EXECUTABLE: /usr/local/bin/ruby
- EXECUTABLE DIRECTORY: /usr/local/bin
- RUBYGEMS PLATFORMS:
- ruby
- universal-darwin-8
- GEM PATHS:
- /usr/local/lib/ruby/gems/1.8
- GEM CONFIGURATION:
- :update_sources => true
- :verbose => true
- :benchmark => false
- :backtrace => false
- :bulk_threshold => 1000
- :sources => ["http://gems.rubyforge.org/";, "http://
gems.github.com"]
- REMOTE SOURCES:
- http://gems.rubyforge.org/
- http://gems.github.com

Remote:

gem environment
RubyGems Environment:
- RUBYGEMS VERSION: 1.0.1 (1.0.1)
- RUBY VERSION: 1.8.6 (2008-03-03 patchlevel 114) [x86_64-linux]
- INSTALLATION DIRECTORY: /usr/local/lib/ruby/gems/1.8
- RUBY EXECUTABLE: /usr/local/bin/ruby
- RUBYGEMS PLATFORMS:
- ruby
- x86_64-linux
- GEM PATHS:
- /usr/local/lib/ruby/gems/1.8
- GEM CONFIGURATION:
- :update_sources => true
- :verbose => true
- :benchmark => false
- :backtrace => false
- :bulk_threshold => 1000
- REMOTE SOURCES:
- http://gems.rubyforge.org

OK, the remote version is 1.0.1 and local is 1.2.0. I tried to upgrade
RubyGems by running...

gem update --system

but it froze without returning as described above.

Any ideas why this would be? Any suggestions for how to get gems
working?

Thanks,

E

.

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