Applies to:
Windows Server 2008 R2 Service Pack 1
Windows Server 2008 R2 SP1
W2K8 R2 Service Pack 1
W2K8 R2 SP1

Note: You should check http://support.microsoft.com for the latest version of the different files.

List of DNS related hotfixes post SP1 for Windows Server 2008 R2 SP1 as of Feb. 2012:

2655960 DNS server stops responding to DNS queries from client computers in in Windows Server 2003, in Windows Server 2008 or in Windows Server 2008 R2

http://support.microsoft.com/?id=2655960
Update(s):
Cache.dns
Dns.exe
Dnsserver.events.xml
Supersede(s):
2648326 "Server Failure" error message and DNS name resolution of external websites fails on a DNS server that is running Windows Server 2008 R2
2616861 DNS Server service does not respond to a CNAME query in the GlobalNames zone correctly in Windows Server 2008 R2
2616776 DNS Server service does not use root hints to resolve external names in Windows Server 2008 R2
2586946 You cannot update the name server records for a domain that has a ".no" top-level country code to use Windows Server 2008 R2-based DNS name servers
2550719 "Name Error 3" error message when you send a query to an EDNS-enabled forwarding DNS server, and the query is resolved by using WINS forward lookup in Windows Server 2008 R2
2549656 DNS Server service randomly cannot resolve external names and returns a "Server Failure" error if IPv6 is disabled in Windows Server 2008 R2
2548145 The size of the Active Directory increases rapidly on a Windows Server 2003-based or Windows Server 2008 R2-based domain controller that hosts the DNS Server role
2508835 DNS Server service does not resolve some external DNS names after it works for a while in Windows Server 2008 R2
2495375 DNS does not respond to a request for a SPF (TXT) DNS record correctly in Windows Server 2008 R2 if the record is larger than 512 bytes
2408181 AAAA record of a Windows Server 2008 or of a Windows Server 2008 R2 domain controller is deleted automatically if the domain controller uses an Active Directory–integrated zone and has a Microsoft 6to4 adapter
983534 Performance of the DNS Server service keeps decreasing under a heavy load situation in Windows Server 2008 R2

2581690 DNS Management snap-in console stops responding when you edit the Name Servers tab in Windows Server 2008 R2

http://support.microsoft.com/?id=2581690
Update(s):
Dnsmgmt.msc
Dnsmgr.dll
Supersede(s):
2522461 Filtering does not work in the DNS Manager snap-in when you reverse lookup DNS zones to filter records in Windows Server 2008 R2

2520155 DNS Host record of a computer is deleted after you change the DNS server assignment

http://support.microsoft.com/?id=2520155
Update(s):
Dnsapi.dll
Dnscacheugc.exe
Dnsrslvr.dll

2665875 An update is available that enables you to receive messages by using a mismatched DNS CNAME alias in Windows 7 or in Windows Server 2008 R2

http://support.microsoft.com/?id=2665875
Update(s):
Mqqm.dll

2659158 You cannot log on to a domain that uses a disjoint namespace in Windows 7 SP1 or in Windows Server 2008 R2 SP1

http://support.microsoft.com/?id=2659158
Update(s):
Netjoin.dll