As you are probably already aware, Microsoft published a few days ago the UR2 for System Center 2012 R2.
Part of this, there is an update for Service Provider Foundation (KB2932939) which could cause an unexpected behaviour. Stan already blogged about it here: http://cloudadministrator.wordpress.com/2014/04/24/tips-for-applying-update-rollup-2-on-system-center-2012-r2-and-windows-azure-pack/
Before applying the update, the SPF site is well configured with the right binding
After that I applied the update and did an IISRESET, I’ve been surprised to see that the binding configuration of my SPF site changed to that:
As you could see, the Site is stopped and this new configuration could clearly not work.
To fix it, simply edit the Bindings, and delete the last one as below:
When done, edit the first record and ensure than your SSL certificate is still selected.
And start your website, everything should work perfectly now J
I hope than Microsoft will test more their UR before they released it next time.