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Home AD DS/DHCP/DNS server

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Well done so far Matt.

Firstly, you should follow normal troubleshooting steps for Internet issues. Is the DSL/line sync light on? Can you log into the modem and run ping diagnostics from there? Ping a domain ( will reply) and an IP (like to check whether it's just DNS that's not working, or is a fault with the Internet connection itself.

How do you physically have things hooked up? In the setup I described I'm expecting that all devices will be able to see each other (ie. plugged into a single switch). You shouldn't have, as an example, the modem plugged into one network card in the server, and the rest of the network plugged in to a different network card. You should ping the modem's IP from the server/desktops to ensure they can see the modem.