/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/net-ldap-0.15.0/lib/net/ldap/connection.rb:64:in `open_connection': SSL_connect returned=1 errno=0 state=error: dh key too small (Net::LDAP::Error)
        from /home/jphamlett/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/net-ldap-0.15.0/lib/net/ldap/connection.rb:699:in `socket'
        from /home/jphamlett/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/net-ldap-0.15.0/lib/net/ldap.rb:1311:in `new_connection'
        from /home/jphamlett/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/net-ldap-0.15.0/lib/net/ldap.rb:1288:in `use_connection'
        from /home/jphamlett/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/net-ldap-0.15.0/lib/net/ldap.rb:771:in `block in search'
        from /home/jphamlett/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/net-ldap-0.15.0/lib/net/ldap/instrumentation.rb:19:in `instrument'
        from /home/jphamlett/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/net-ldap-0.15.0/lib/net/ldap.rb:770:in `search'
        from /home/jphamlett/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/net-ldap-0.15.0/lib/net/ldap.rb:1195:in `search_root_dse'
        from /home/jphamlett/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/net-ldap-0.15.0/lib/net/ldap.rb:1261:in `paged_searches_supported?'
        from /home/jphamlett/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/net-ldap-0.15.0/lib/net/ldap.rb:763:in `search'
        from ldap.rb:15:in `<main>'

require 'net/ldap'

ldap = Net::LDAP.new  :host => "ldap.umn.edu", # your LDAP host name or IP goes here,
                      :port => "636", # your LDAP host port goes here,
                      :encryption => :simple_tls,
                      tls_options: { verify_mode: OpenSSL::SSL::VERIFY_NONE },
                      :base => "o=University of Minnesota,c=US", # the base of your AD tree goes here,
                      :auth => {
                        :method => :simple,
                        :username => "", # a user w/sufficient privileges to read from AD goes here,
                        :password => "" # the user's password goes here
                      }

search_filter = Net::LDAP::Filter.eq("uid", "hamle010")
ldap.search(:filter => search_filter, :return_result => false) { |item|
    puts item
}