Win32 OpenSSL::SSL::SSLError at /auth/facebook/callback

If you're getting this:

OpenSSL::SSL::SSLError at /auth/facebook/callback
SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed

It means that open-ssl cannot find your ca_certs (which live under /etc/ssl/certs), which is correct if you're on windows anyway.

If in rails (using Windows), try disabling verification:

    Rails.application.config.middleware.use OmniAuth::Builder do
        provider :facebook, FACEBOOK_KEY, FACEBOOK_SECRET, {:client_options => {:ssl => {:verify => false}}}

You're going to deploy on Linux any way (and you shouldn't be developing on an env that isn't identical to your prod env), but you can at least go on.