windows 2012 server clients unable to connect to internet

I have a small network ( 1 windows 2012 server, 3 workstations).  The server is running as a Domain Controller with DNS and DHCP enabled.  All the workstations are connected to the domain and can access and ping the server, but they cannot connect to the internet.  The server is configured with its address, plus the 2 outside addresses for DNS.  The workstations have the server address as the DNS.  IF i change the workstations DNS to the outside addresses for DNS Servers, they can get to the internet.  I am not sure what is not configured right.  I have a similar network setup with a windows 2003/2008 server and i have it configured the same and it works fine.  Not sure what has changed in 2012.  I have found some suggestions to configure a forward to the external DNS servers but i haven't tried that yet.  Anyone got any ideas?
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Yes, in the DNS management of the server, add the DNS servers you already mentioned (from the ISP or public) as forwarders.

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Check the firewall rules for windows 2008/2003
Tony GiangrecoCommented:
On all workstations, the TCP/IPv4 properties should have the DNS server listed as the primary DNS server's address.  As a safety measure, you can add Google DNS as the secondary DNS address on all workstations if your network DNS has a problem.

The Google DNS is primary:, secondary

I would check the DNS server settings but adding Google DNS should provide immediate access to the web for all workstations if your firewall and router are not blocking outbound access.  Your primary and secondary DNS entries on your DNS server may be wrong.  You can also try restarting the DNS service on the server where that service is running.
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Windows Server 2012

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