Trying to install SessionTimeout plugin

c:/ruby/lib/ruby/1.8/open-uri.rb:290:in `open_http': 500 Internal error
(OpenURI
::HTTPError)

you're getting a 500 error returned, that's the problem...the url you
are using is actually the trac page for the repository, not the
repository itself

you want to checkout the code from

http://opensource.agileevolved.com/svn/root/rails_plugins/session_timeout/trunk

that should work

Chris