Hello,
access to most backend websites on the mailbox server logs asp.net Event ID 1310 A configuration error ocured.
Looking to the web.config file A reference to D:\Exchange\ClientAccess\SharedWebConfig.Config has been found, but this file did not exist on both servers MBX and CAS role. The Installdir has been set to D:\Exchange during Installation wizard. The setup did not log any error creating such a file to C:\ExchangeSetupLogs\ExchangeSetup.log.
Another machine installed with Exchange 2013SP1, then updated to CU7 is OK. \TF