The Firewall service (Wspsrv.exe) in Microsoft Threat Management Gateway (TMG) 2010 may crash intermittently when the DiffServ filter is enabled.
To work around this problem, disable the DiffServ filter at the array level.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Article ID: 2963811 - Last Review: Jun 27, 2014 - Revision: 1
Microsoft Forefront Threat Management Gateway 2010 Enterprise, Microsoft Forefront Threat Management Gateway 2010 Standard