HI We have had ISA Server 2000 running for around 7 months with no trouble at all. We know we have set this up correctly and are happy with th way it has been running with around 50 users. Since August 2003 we have added around 150 users, bring the total number of users up to 200 users. Everything has been running fine since, up until 5 days ago. All the users have seen a massive slowdown in internet speed. We have an 8MB line to the internet so we know its not lack of bandwidth, even though we have heavy web traffic. We were very confused because another one of our sites which is much smaller had exactly the problem at the same time, but thismay just be a coincidence. Since then we have found that making the users install a firewall client and asking them to enable "Use a proxy server for your LAN", in LAN Settings under Internet options has improved the speed of the internet dramatically bringing the services back to normal. Our ISA setup is basic, as we are not in a corporate network. So there is no domain, etc. But our ISA config is a little more complex, with MSN and KAzaa enabled but restricted to useonly a percentage of the bandwidth, but i dont see this as the problem as it has always been there and has been used. Can anyone shed light on what can be causing the problem? Regards Sachin