Bit of a long one but in summary - Users are unable to login to OWA/EWS and ECP
This is the admin server for a small business of ~10 employees, it is a single physical machine installed with Windows Server Std 2012, and Exchange standard 2013.
Recent history includes installation of a hotfix to allow additional USB backup drives to be added individually - http://support.microsoft.com/kb/2833738 - following this and the reboot there were issues with access to EWS noticed by the boss's Mac, and by me getting into OWA. Login would work but you would be forwarded to an empty white page. ASP.NET warnings in the application event log : ASP.NET 4.0.30319.0 "Event message: An unhandled exception has occurred."
I investigated this but was unable to identify a particular fix, so with CU2 currently installed we upgraded with SP1 (aka CU4 after first...