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web filtering solution for medium business

a77 asked
what is the best web filtering solution for medium business, free if possible,server 2008 installed but in workgroup enviroment.
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Distinguished Expert 2018
Web filtering is almost always done best at the network edge. It can be protocol aware, cannot be bypassed by software brought in on USB keys, or by bypassing DNS filters such as OpenDNS. A business should have a good firewall anyways, and almost all good firewalls have this built-in.

Look at SonicWall, Watchguard, Calystix, ISA appliance (Celestix is one I like), or even taking an older PC, installing a second NIC, and setting up Untangle (open source proxy linux software.) All would be very functional and very effective. For a seriously constrained budget, Untangle can't be beat.