- You configure an authoritative Domain Name System (DNS) that has a zone such as contoso.com on a server that is running Windows Server 2012 R2.
- You configure the Time to Live (TTL) value for the Start of Authority (SOA) resource record at 1 (one) minute. You leave the minimum zone TTL that is defined in the SOA at its default setting of 1 (one) hour.
- You configure a recursive server that uses a conditional forwarder for the contoso.com zone. The conditional forwarder points to the server that is configured in the first bullet point.
- On the recursive server, you query the localhost for a subdomain record that does not exist in the zone, such as sales.contoso.com. Notice that you will receive a response that contains the SOA as configured at a TTL of 3600 (not 60, which is the correct value per the DNS RFC).
- You query the same nonexistent subdomain record again and notice that the negative cache is counting down.
- You create the "sales" subdomain record on the authoritative server. Then, you repeat bullet item 3 to query for this new record.
In this scenario, you cannot resolve the subdomain name because the negative cache is still counting down.
However, a Windows Server 2012 R2-based recursive DNS server incorrectly always uses the SOA Minimum TTL when it calculates the TTL value. This hotfix forces the server to use the minimum value for the SOA TTL and the SOA Minimum TTL.
Hotfix informationA supported hotfix is available from Microsoft Support. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.
Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, go to the following Microsoft website: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
Restart requirementYou do not have to restart the computer after you apply this hotfix.
Hotfix replacement informationThis hotfix does not replace any previously released hotfix.
Article ID: 3064749 - Last Review: Jul 14, 2015 - Revision: 1