This may be a DNS issue that some SBS'ers have reported after the SP1 install. Try the following command from a command prompt to turn off EDNS0 support and see if that helps: dnscmd /Config /EnableEDnsProbes 0
Then give it another try. You can take a look at the following KB article for more information: DNS query responses do not travel through a firewall in Windows Server: http://support.microsoft.com/?id=828263.
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