You cannot connect to a database stored in Microsoft Azure SQL Database in Windows Server 2012

Applies to: Windows Server 2012 DatacenterWindows Server 2012 DatacenterWindows Server 2012 Essentials More

Symptoms


Assume that you have database stored in Microsoft Azure SQL Database in a Windows Server 2012-based failover cluster environment. The cluster is under memory, network and disk pressure. In this situation, you cannot connect to the database because of Internet connection problems in Windows Azura SQL Database nodes.

Cause


This issue occurs because VMSwitch.sys waits for an object identifier (also known as OID) to respond. Additionally, network adapter resets every 8 seconds.

Resolution


This hotfix is also available at Microsoft Update Catalog.

Hotfix information


A supported hotfix is available from Microsoft. 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 this specific problem.

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, submit a request to 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, visit 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.

Prerequisites

To apply this hotfix, you must be running Windows Server 2012. Additionally, all virtual machines (VMs) that run on the Windows Server 2012-based host must be updated with the latest Integration Services.

Registry information

To apply this hotfix, you do not have to make any changes to the registry.

Restart requirement

You have to restart the VMs on the host after you apply this hotfix. However, you do not have to restart the host computer.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

Status


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information


For more information about how to troubleshoot connection problems to Azure SQL Database, go to the following Microsoft knowledge base article:
2980233 Troubleshoot connection problems to Azure SQL Database
For more information about how to update the latest integration services, go to the following Microsoft website:
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates