Certificate errors when using Devise with Facebook Oauth

Question

Hi all-

I'm using devise with oauth and Rails 3 (ruby 1.9.2) to log user's into my site. I followed this excellent blog post. That being said, I am getting a weird OpenSSL error, that seems to be due to some kind of certificate verification error. Heres what it looks like:

OpenSSL::SSL::SSLError in Devise/oauth callbacksController#facebook

SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed

Any thoughts on why this might be happening and how I might be able to fix it (preferably without turning off cert verification)

Thanks!