Forefront Threat Management Gateway (TMG) 2010 is a firewall that runs on Windows and is made by Microsoft. An example of how this can be used is as a secured authentication point for Outlook Web App, Exchange ActiveSync, Outlook Anywhere and much more.
If you reboot your TMG server you may see an issue where some, but not all of the Forefront TMG services will start. This is due to an issue where a service start-up delay may be required.
Set the following services to Automatic (Delayed start): Microsoft Forefront TMG Firewall, Microsoft Forefront TMG Job Scheduler and Microsoft Forefron TMG Managed Control. Note: These services may take up to 5 minutes to start.