We tried to install SP1 on our Exchange 2010 server yesterday, and it hung on the Hub Transport upgrade. We rebooted, tried again and the same. We thought Groupshield might be the issue, so removed it and tried again. Still the same. As it stands, The Exchange Management Console is inaccessible, stating initialization failed. Powershell also cannot connect to the server.
We can still send and receive email fine, but OWA is not functioning, so we also don't have activesync.
The event log is full of ASP.Net errors, event ID 1310 stating
Exception message: Could not load file or assembly 'Microsoft.Exchange.Security, Version=184.108.40.206, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified. (C:\Program Files\Microsoft\Exchange Server\V14\ClientAccess\Autodiscover\web.config line 855)
Replacing this file with one from a working system has no effect.
Any ideas would be very much appreciated!