Article ID: 2685784
When upgrading to Microsoft Forefront Unified Access Gateway 2010 (UAG) Service Pack 1 (SP1), the upgrade fails with error 1603 and rolls back. You may also see the following in the UAG SP1 Setup log files for UAG which are located at %ProgramData%\Microsoft\UAG\Logs:
This can occur if UAG is configured with the Sharepoint-specific download and upload endpoint policies prior to running the SP1 upgrade. The installation process raises an exception and rolls back when the name of one (or more) of the existing standard policies is in use by an application.
To resolve this issue, create new custom policies with the same data and use those instead of the Sharepoint-specific download and upload endpoint policies.
For more information see the following:
Configuring Forefront UAG access policies : http://technet.microsoft.com/en-us/library/dd857309.aspx
(http://go.microsoft.com/fwlink/?LinkId=151500)for other considerations.