Unable to install required gems

Hello there! I have used RailsInstaller in my Win7 as environment.
Lately, I
have been unable to install required gems using bundle install which
produces result similar to below:

Using sqlite3 (1.3.4)
Using uglifier (1.0.3)
rescue in request': too many connection resets (http://production.cf.rubygems.org/gems/webrat-0.7.1.gem) (Gem::RemoteFetcher::FetchError) from C:/RailsInstaller/Ruby1.9.2/lib/ruby/site_ruby/1.9.1/rubygems/remote_fetcher.rb:372:inrequest’

Do anyone have idea what I should do?