Issue

When I tried to install the Openshift Client Tools all seemed well until I tried to run rhc-setup:

C:\Windows\System32>rhc setup
C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require': cannot load such file -- dl/import (LoadError)
from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/net-ssh-2.9.2/lib/net/ssh/authentication/pageant.rb:1:in `'

from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/net-ssh-2.9.2/lib/net/ssh/authentication/agent/socket.rb:5:in `'
from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/net-ssh-2.9.2/lib/net/ssh/authentication/agent.rb:22:in `'
from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/net-ssh-2.9.2/lib/net/ssh/authentication/key_manager.rb:4:in `'
from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/net-ssh-2.9.2/lib/net/ssh/authentication/session.rb:4:in `'
from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/net-ssh-2.9.2/lib/net/ssh.rb:11:in `'
from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rhc-1.35.3/lib/rhc/ssh_helpers.rb:18:in `'
from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rhc-1.35.3/lib/rhc/wizard.rb:77:in `'
from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rhc-1.35.3/lib/rhc/wizard.rb:7:in `'
from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rhc-1.35.3/lib/rhc/wizard.rb:6:in `'
from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rhc-1.35.3/lib/rhc/commands/base.rb:4:in `'
from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rhc-1.35.3/lib/rhc/commands/account.rb:2:in `'
from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rhc-1.35.3/lib/rhc/commands/account.rb:1:in `'
from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rhc-1.35.3/lib/rhc/commands.rb:189:in `block in load'
from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rhc-1.35.3/lib/rhc/commands.rb:188:in `each'
from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rhc-1.35.3/lib/rhc/commands.rb:188:in `load'
from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rhc-1.35.3/lib/rhc/cli.rb:36:in `start'
from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rhc-1.35.3/bin/rhc:20:in `'
from C:/Ruby22-x64/bin/rhc:23:in `load'
from C:/Ruby22-x64/bin/rhc:23:in `'


Fix

This turns out to be some incompatibility between the rhc client and net-ssh that can be remedied by upgrading net-ssh to 2.9.3.beta1:

C:\Windows\System32>gem install net-ssh -v 2.9.3.beta1
Fetching: net-ssh-2.9.3.beta1.gem (100%)
Successfully installed net-ssh-2.9.3.beta1
Parsing documentation for net-ssh-2.9.3.beta1
Installing ri documentation for net-ssh-2.9.3.beta1
Done installing documentation for net-ssh after 3 seconds
1 gem installed

Outcome

After that it works as expected:

C:\Windows\System32>rhc setup
OpenShift Client Tools (RHC) Setup Wizard

If you have your own OpenShift server, you can specify it now. Just hit enter to use the server for OpenShift Online: openshift.redhat.com.
Enter the server hostname: |openshift.redhat.com|

I hope this helps someone.