This article lists the issues that are resolved in Software Update 1 Rollup 3 for Microsoft Forefront Threat Management Gateway (TMG) 2010 Service Pack 1 (SP1).
This article lists Microsoft Knowledge Base articles that apply to Forefront TMG 2010 SP1. The issues that are described in these articles are resolved in Software Update 1 Rollup 3 for Forefront TMG 2010 SP1.
As you can see there are a lot of fixes in this rollup, I particularly worked in many issues involving 2501650 and 2502686 while the hotfixes were not even ready. Due the nature of those issues I strong recommend you to download this update and plan the installation on your Forefront TMG.
To install this update, you must have TMG 2010 SP1 and Update 1 already installed.
Issues that are resolved by Software Update 1 Rollup 3:
More Info and Download: KB2498770