title: Magento - Can't Access Checkout with SSL
body: <p>I'm having a problem in my Magento store.  If I turn on SSL on the frontend I can't access the checkout.  When I try to go to the checkout I just get bounced back to the cart page.</p>
  
  <p>If the customer logs in first then it works fine but guests just can't reach the checkout.</p>
  
  <p>The 'My Account' section works fine with SSL.</p>
  
  <p>If I turn SSL off then the checkout can be access by everyone without a problem.</p>
  
  <p>Any ideas what could be causing this?</p>