When you monitor the memory consumption of the Forefront UAG User Manager Service (Usermgrcom.exe) instance in Microsoft Forefront Unified Access Gateway (UAG) 2010, the Private Bytes counter in Performance Monitor may continually increase.
This problem occurs because of a memory leak in the Forefront UAG User Manager Service.
To resolve this problem, install the service pack that is described in the following Microsoft Knowledge Base article:
2744025 Description of Forefront Unified Access Gateway 2010 Service Pack 3
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
Article ID: 2811063 - Last Review: Feb 20, 2013 - Revision: 1
Microsoft Forefront Unified Access Gateway 2010, Microsoft Forefront Unified Access Gateway 2010 Service Pack 1, Microsoft Forefront Unified Access Gateway 2010 Service Pack 2