How do I update Ruby Gems from behind a Proxy (ISA-NTLM)

Question

The firewall I'm behind is running Microsoft ISA server in NTLM-only mode. Hash anyone have success getting their Ruby gems to install/update via Ruby SSPI gem or other method?

... or am I just being lazy?

Note: rubysspi-1.2.4 does not work.

This also works for "igem", part of the IronRuby project

Answer 1

For the Windows OS, I used Fiddler to work around the issue.

1. Install/Run Fiddler from www.fiddler2.com

2. Run gem:

   $ gem install --http-proxy http://localhost:8888 $gem_name