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Check the Fw on the server make sure it's not blocking dns 53
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Simply re-running the Internet connection wizard resolved the problem.
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After migrating from SBS 2003 to SBS 2011 the client computers are experiencing problems with web pages. When you open Internet Explorer and try to access the home page sometimes it works while other times it may take two or three refreshes before it will actually go to the home page. As you type in a different address you experience the same issue. If I change their DNS address to point to the router accessing the internet is fast and works as it should. It is only when DNS is pointed to the server that there are problems. <br />
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I've cleared the cache on the DNS Server and checked the IP settings. The forwarders are also setup in the DNS. <br />
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I've flushed the DNS on the client PC's as well and also reset IE.<br />
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Any other suggestions?
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After migrating from SBS 2003 to SBS 2011 the client computers are experiencing problems with web pages. When you open Internet Explorer and try to access the home page sometimes it works while other times it may take two or three refreshes before it will actually go to the home page. As you type in a different address you experience the same issue. If I change their DNS address to point to the router accessing the internet is fast and works as it should. It is only when DNS is pointed to the server that there are problems. 

I've cleared the cache on the DNS Server and checked the IP settings. The forwarders are also setup in the DNS. 

I've flushed the DNS on the client PC's as well and also reset IE.

Any other suggestions?

Slow or unresponsive internet after SBS 2003 to SBS 2011 migration

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).