Rails 3.1 beta installation hangs because of mime-types gem

I get the following failure whilst trying to install rails3.1.beta on ubuntu10.10

gem install mime-types
Fetching: mime-types-1.16.gem ( 97%)ERROR:  While executing gem ... (Gem::RemoteFetcher::FetchError)
    too many connection resets (http:/开发者_如何学编程/production.cf.rubygems.org/gems/mime-types-1.16.gem)

Anyone else seeing this?

Using latest rubygems 1.8.3 and ruby 1.9.2p180 and I've installed all the dependencies for the mime-types gem (i.e. hoe, rcov, nokogiri, archive-tar-minitar)

rubygems.org does say that mime-types is the second most downloaded gem today with over 5000 dl's - I've tried to isntall several times and it keeps hanging at 97%, everytime

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Do you really need the mime-types gem? That seems to be an old gem - isnt the mime type stuff built into Rails sufficient?