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After installing Active Directory on our new server (Windows Server 2008 R2) following these requirements we lost internet connectivity on the server itself.

How can we restore it? Using the second NIC available?


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How is the server's DNS configured? – Shane Madden Aug 30 '11 at 15:06
up vote 2 down vote accepted

This sounds very like a DNS issue, or possibly a routing one - can you ping remote hosts by IP? (, for example?

As the linked article mentions, the new DC will be its own primary DNS server, so it will be able to see all the resource records that AD sticks into DNS. Unless you've got a forwarder configured to handle requests for things that aren't in your local DNS, you will indeed lose Internet connectivity.

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No unfortunately I cannot ping both IP and domain name. What should I check? – Alberto Aug 30 '11 at 15:33
Check the server's TCP/IP config, especially the DNS servers and default gateway; can you ping other machines on your LAN from the server? Also, you may want to check the DNS console (as opposed to the NIC settings) on the server. – RainyRat Aug 30 '11 at 15:44
I agree with @RainyRat that this sounds an awful lot like a DNS configuration issue. Have you checked that you have a forwarder configured? Is your server pointing to itself for primary DNS? – Josh Blair Aug 30 '11 at 17:04
I followed this tutorial for active directory installation but it looks like there is something missing. I also configured IPv4 as specified in these prerequisites:…. Why I cannot ping from client machines? – Alberto Aug 31 '11 at 12:33
The tutorial gets you to configure your server as; do your clients also have IP addresses in the same range? Also, the tutorial makes no mention of setting a default gateway, which you'll probably need in order to connect to the Internet, or anything else outside your subnet. – RainyRat Aug 31 '11 at 12:49

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