Amazon EC2 instances created from Amazon Machine Images (AMIs) of Windows Server 2012 R2 that were made available before September 10, 2014 might lose network and storage connectivity after an instance reboot.

The Plug and Play Cleanup feature in Windows Server 2012 R2 scans for and disables inactive system devices every 30 days. This feature identifies the EC2 network device as inactive and removes it from the system, causing the instance to lose network connectivity after a reboot.

For Windows Server 2012 R2 AMIs made available before September 10, 2014, we are providing an in-place driver upgrade. You can download the software package and run it on your existing instances.

Microsoft Windows Server 2012 R2 AMIs published between September 10 and October 14, 2014 are preconfigured with a disabled Plug and Play Cleanup task, so you can stop and start, resize and reboot as needed. Windows Server 2012 R2 AMIs published on or after October 15, 2014 include an updated paravirtualization (PV) driver that is compatible with the Plug and Play Cleanup task.

If you are unable to perform the in-place driver upgrade on your pre-September 10, 2014 instance, we are providing a script to help. The script will allow you to quickly determine if your instance is affected. If it is affected, and the device has not yet been removed, the script will disable the Plug and Play Cleanup scan. If the device has already been removed, the script will repair the device, disable the Plug and Play Cleanup scan, and allow your instance to reboot with network connectivity enabled.

For detailed information about this issue, see the FAQs section of Important information about Amazon EC2 instances running Windows Server 2012 R2.

Amazon Elastic Compute Cloud, Windows Server 2012 R2, instance, network connectivity, storage, paravirtualization, driver


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