![]() ![]() The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. ![]() Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix. If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix. ![]() This hotfix might receive additional testing. Apply this hotfix only to systems that are experiencing the problem described in this article. However, this hotfix is intended to correct only the problem that is described in this article. Resolution Hotfix informationĪ supported hotfix is available from Microsoft. This issue occurs because the DNS service parses the OPT record in a DNS response packet incorrectly. When this issue occurs, DNS Event ID 5501 is logged in the event log, together with the following message:Īdditionally, when you run the following nslookup command to diagnose the issues in the DNS infrastructure, the command operation fails togethet with a "Server Failure" error: This name resolution failure can cause connectivity failures. When you query for a name on a Domain Name System (DNS) server that is running Windows Server 2008 R2, the DNS service may parse the OPT record in a DNS response packet incorrectly. Therefore, a DNS response packet is marked as invalid, and a "Server Failure" error is returned to the client. Windows Server 2008 R2 Enterprise Windows Server 2008 R2 Datacenter Windows Server 2008 R2 for Itanium-Based Systems Windows Server 2008 R2 Foundation Windows Server 2008 R2 Standard Windows Server 2008 R2 Web Edition More. ![]()
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