We need to allow all employees to surfing the internet for just one hour per day , any user can surf the internet anytime through the day but for only one hour after he is exceed the time limit the browser close automatically , sure I don't mean to scheduling the internet ,It just like time quata or timer .
Bear in mind that this is a blunt instrument. If I load a web page, I may be "browsing" (in the network sense) for a few microseconds. But I may then read the page, or use a Flash game on the page for considerably longer than that. I may even open it in the background and come to it much later. It would be annoying for the browser window to close before I had chance to read the page.
So TMG can not really know how long a web page is open for. Other than endpoint controls, I'm not sure that you can really control this in the way you'd like to.
You might have more success from the TMG end if you consider limiting access on one of the following bases:
Defined periods of time throughout the day
Maximum transferred bandwidth
URL category filtering - maximum number of hits on non-work related sites
Of course, if employees can't be trusted to limit their online activity when they're supposed to be working, management has a problem on its hands that no amount of electronic controls can overcome.
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