Announcing Windows Server Insider Preview Build 16267

Hello Windows Insiders!
Today we are pleased to be releasing Windows Server Insider Preview Build 16267 to Windows Insiders. To obtain the build, registered Insiders may navigate directly to the Windows Server Insider Preview download page. Matching symbols and the Remote Server Administration Tools (RSAT) packages are available on the same page. When installed on a Windows 10 client, RSAT allows a user to remotely manage and administer Insider Preview builds of Windows Server via GUI tools. Valid on Windows 10 client builds greater than 16250.
For the best experience, the Windows Server team recommends a clean install.
If you have not yet registered as an Insider, register through the Windows Insiders for Business program or the Windows Insider program.
General Scenario Highlights
Developers and Containers:
New base container images (available on Windows Insider Docker Hub repo)
Optimized Nano Server base image (over 70% smaller)
The .NET team is providing a preview image based on Nano Server with .NET Core 2.0
The PowerShell team is providing a preview image based on PowerShell 6.0

Optimized Server Core base image (over 20% smaller)

Support for SMB volume mounting
Infrastructure for Orchestrators
Networking enhancements for ongoing Kubernetes work
Named pipe mapping support

Bug fixes, performance enhancements
Cloud Guest:
TLS info: administrators can make specific recommendations to default to HTTPS

Disaster Recovery
Storage Replica Test Failover

Guest + Host better together
vPMEM in Guest: Tenants can use and manage PMEM/SCM
Tenant-Aware VM Start Ordering: App Ready / OS Heartbeat for better load balancing
Guest RDMA

Improvement in time accuracy
Azure enlightened clusters – optimized to run on Azure IaaS
Cloud Host:
Software Defined Data Center (SDDC) host
Shielded Linux VM
SDN: Encrypted virtual networks
Secure clusters
SMB 1 disabled by default

Resiliency and Availability
SDN: Reduced downtime for tenant connections through gateways
Spaces Direct: Scoped Spaces to mitigate impact of multi-node loss
Spaces Direct: Marginal drive handling for predictive detection of drive failures

Data Deduplication available for ReFS
New Data Deduplication DataPort API for optimized ingress/egress
Space efficiency with ReFS Compaction
Performant Spaces Direct Multi Resilient Volumes (MRV)

Hyper-converged Scale
Cluster Sets: Significantly increases hyper-converged SDDC cloud scale by grouping multiple clusters into a larger fabric

Hardware support
Support for Storage Class Memory (SCM) in Spaces Direct

What’s New in Build 16267 for Windows Server
There are no new features in build 16267
How to Download 
NOTE: If you signed up for Windows Insiders for Business using an AAD account, there is a temporary issue with access to the Windows Server Download page using AAD accounts. If you registered using an MSA account at the Windows Insider program, your MSA account may be used to access the page and to download builds until this is resolved.
The latest Windows Server build and matching symbols are available for download here.  Simply click on the desired file(s) and save locally. Matching Windows Server container images will be available via the Docker Hub. For more information about Windows Server containers and Insider builds, please visit
The following keys are available for unlimited activations of Windows Server. These keys may be used throughout the pre-release cycle.
Windows Server Datacenter Core: B69WH-PRNHK-BXVK3-P9XF7-XD84W
Windows Server Standard Core: V6N4W-86M3X-J77X3-JF6XW-D9PRV
The RSAT version currently posted has not been updated, so if you already have it, you won’t need to download it again.
It’s all about your feedback! 
Use the Feedback Hub app to provide feedback on Windows Server builds. Feedback Hub comes pre-installed on Windows 10. Register a Windows 10 device with the Windows Insider or Windows Insider for Business programs. Open the Feedback Hub application. Choose the Server category and then the appropriate subcategory for your feedback. Please indicate what edition and build number you are providing feedback on. The Feedback Hub app cannot scan a server for diagnostic information, however you may manually attach screenshots or other files to your feedback entry.
We encourage you to visit the Windows Server Insiders space on the Microsoft Tech Communities forum to collaborate, share and learn from experts.
The expiration date for this server preview build is 12/4/2017.
Known issues 
Cluster Sets: A couple of key functionalities to enable end-to-end testing of Cluster Sets scenarios are not present in this build, so defer all evaluation of this scenario to a future build.
When a computer runs the Windows Preinstallation Environment (WinPE) from a local drive, the EFI system partition, which contains the WinPE image (boot.wim), does not have a drive letter assigned. This issue can adversely affect some automation.
Apps that call into the firewall, such apps that use networking, may become unresponsive until the user reboots because of an application hang end-task error (0xCFFFFFFF) in the Windows firewall API library (FirewallAPI.dll), which occurs when the library is blocked on an advanced local procedure call (ALPC) port while attempting to diagnose a connection failure and retrieve information.
A stop error may occur during volume repair in a cluster. The recommended workaround is to restart the computer. No corruption or data loss is expected.
No downtime for Hustle-As-A-Service,