Cant get to internet DNS issue Upgrading to server 2008 R2 DC

    I have an office that is running a server 2003 environment and I wanted to go to 2008. I did all the usual forest upgrades, adprep /forestprep and so on, I ran DC promo on server 2008 and it says it was all successful. I made the new server the operations master and all the other things you do for an upgrade and promo.

Prior to running to demoting the 2003 server I wanted to just power it down. To be sure the environment would run Ok. All seems to be ok except, no internet. Seems to be DNS related.  I can get into firewall form outside and can remote into server form outside so I know ISP is good. Checked firewalls and internal DNS are not point to old DC. But when I power old 2003 DC back on internet is back.

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Mike RoeCommented:
Are you running DHCP that is giving out old IP address for DNS
tkthelpdeskAuthor Commented:
running DHCP from firewall, but those look right. Even hardcoding static IP and DNS for internal either to the firewall or to the new DC did not work.
Did you install DNS services on new server?
Check if windows firewall is blocking anything on new server.
Can you see DNS related errors on event logs on new server?
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tkthelpdeskAuthor Commented:
yes put DNS on new DC. I can get everywhere else on network with new server just not out to internet.

I will see what logs have
Mike RoeCommented:
can you ping  by IP address

Try that is google public DNS server
tkthelpdeskAuthor Commented:
Yes I can ping it and and I do not see any firewall errors
tkthelpdeskAuthor Commented:
any more ideas? so to recap, I made two server 2008 R2 domain controllers and still have the one 2003 DC (the original) running. DNS does not work if I turn it off on 2003 server? Not sure why other two new DC not picking it up?
Mike RoeCommented:
I would remove DNS from new machine.  Remove the 2003 server and then add the DNS back to the new server without the 2003 server running.

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tkthelpdeskAuthor Commented:
So if I understand, remove DNS form the Server 2008 DC, then demote the 2003 DC and remove dns and then add back to Server 2008?
Mike RoeCommented:
Make sure your new servers are allowed to query DNS server outside of your network also try setting forwarding DNS queries to ISPs DNS server
Check this link
tkthelpdeskAuthor Commented:
I ended up doing this.
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