Windows server vnext server

Hello Windows Server Insiders!

Today we are pleased to release a new build of the next Windows Server Long-Term Servicing Channel (LTSC) Preview that contains both the Desktop Experience and Server Core installation options for Datacenter and Standard editions, Annual Channel for Container Host and Azure Edition (for VM evaluation only). Branding remains, Windows Server 2025, in this preview — when reporting issues please refer to Windows Server vNext preview.  If you signed up for Server Flighting, you should receive this new build automatically.

Please note this will be the last Windows Server Insider Preview until January 2025. We look forward to seeing you in the new year!

What’s New

Windows Defender Application Control for Business (WDAC)

Windows Defender Application Control (WDAC) for business is a software-based security layer that reduces attack surface by enforcing an explicit list of software that is allowed to run. Introduced with Windows Server 2025, we have provided Microsoft defined ‘default policy’ which can be applied to the server via PowerShell cmdlets, powered by our ‘Security configuration platform called ‘OSconfig’. 

To learn more, please review Windows Defender Application Control for Business (WDAC) — Microsoft Community Hub

Windows Admin Center (WAC)

Beginning with build 26252, Windows Server preview customers can download and install Windows Admin Center right from the Windows Server Desktop using the in-OS app that takes care of downloading and guides you through the installation process. 

Note: You must be running a desktop version of Windows Server Datacenter or Standard preview to access this feature.  

Windows Server Flighting is here!!

If you signed up for Server Flighting, you should receive this new build automatically later today.

For more information, see Welcome to Windows Insider flighting on Windows Server — Microsoft Community Hub

Feedback Hub app is now available for Server Desktop users!

The app should automatically update with the latest version, but if it does not, simply Check for updates in the app’s settings tab.

Known Issues

Download Windows Server Insider Preview (microsoft.com)

Flighting: The label for this flight may incorrectly reference Windows 11. However, when selected, the package installed is the Windows Server update. Please ignore the label and proceed with installing your flight. This issue will be addressed in a future release.

Available Downloads

Downloads to certain countries may not be available. See Microsoft suspends new sales in Russia — Microsoft On the Issues.

• Windows Server Long-Term Servicing Channel Preview in ISO format in 18 languages, and in VHDX format in English only. 
• Windows Server Datacenter Azure Edition Preview in ISO and VHDX format, English only.
• Microsoft Server Languages and Optional Features Preview

Keys: Keys are valid for preview builds only 

• Server Standard: MFY9F-XBN2F-TYFMP-CCV49-RMYVH
• Datacenter: 2KNJJ-33Y9H-2GXGX-KMQWH-G6H67
• Azure Edition does not accept a key

Symbols:  Available on the public symbol server – see Using the Microsoft Symbol Server. 

Expiration: This Windows Server Preview will expire September 15, 2025.

How to Download

Registered Insiders may navigate directly to the Windows Server Insider Preview download page.   If you have not yet registered as an Insider, see GETTING STARTED WITH SERVER on the Windows Insiders for Business portal.

We value your feedback!

The most important part of the release cycle is to hear what’s working and what needs to be improved, so your feedback is extremely valued. Beginning with Insider build 26063, please use the new Feedback Hub app for Windows Server if you are running a Desktop version of Server. If you are using a Core edition, or if you are unable to use the Feedback Hub app, you can use your registered Windows 10 or Windows 11 Insider device and use the Feedback Hub application.  In the app, choose the Windows Server category and then the appropriate subcategory for your feedback. In the title of the Feedback, please indicate the build number you are providing feedback on as shown below to ensure that your issue is attributed to the right version:

     [Server #####] Title of my feedback

See Give Feedback on Windows Server via Feedback Hub for specifics.

The Windows Server Insiders space on the Microsoft Tech Communities supports preview builds of the next version of Windows Server. Use the forum to collaborate, share and learn from experts.  For versions that have been released to general availability in market, try the Windows Server for IT Pro forum or contact Support for Business.

Diagnostic and Usage Information

Microsoft collects this information over the internet to help keep Windows secure and up to date, troubleshoot problems, and make product improvements. Microsoft server operating systems can be configured to turn diagnostic data off, send Required diagnostic data, or send Optional diagnostic data.   During previews, Microsoft asks that you change the default setting to Optional to provide the best automatic feedback and help us improve the final product.

Administrators can change the level of information collection through Settings. For details, see http://aka.ms/winserverdata. Also see the Microsoft Privacy Statement.

Terms of Use

This is pre-release software — it is provided for use «as-is» and is not supported in production environments. Users are responsible for installing any updates that may be made available from Windows Update.   All pre-release software made available to you via the Windows Server Insider program is governed by the Insider Terms of Use.

Written By

published


August 26, 2020

Hello Windows Insiders!

Today we are excited to release a new build of the Windows Server vNext Long-Term Servicing Channel (LTSC) release that contains both the Desktop Experience and Server Core installation options for Datacenter and Standard editions.

What’s New

CoreNet: Data Path and Transports

• MsQuic – an open source implementation of the IETF QUIC transport protocol powers both HTTP/3 web processing and SMB file transfers.

• UDP performance improvements — UDP is becoming a very popular protocol carrying more and more networking traffic. With the QUIC protocol built on top of UDP and the increasing popularity of RTP and custom (UDP) streaming and gaming protocols it is time to bring the performance of UDP to a level on par with TCP. In Server vNext we include the game changing UDP Segmentation Offload (USO). USO moves most of the work required to send UDP packets from the CPU to the NIC’s specialized hardware. Complimenting USO in Server vNext we include UDP Receive Side Coalescing (UDP RSC) which coalesces packets and reduces CPU usage for UDP processing. To go along with these two new enhancements, we have made hundreds of improvements to the UDP data path both transmit and receive.

• TCP performance improvements — Server vNext uses TCP HyStart++ to reduce packet loss during connection start up (especially in high speed networks) and SendTracker + RACK to reduce Retransmit TimeOuts (RTO). These features are enabled in the transport stack by default and provide a smoother network data flow with better performance at high speeds.
• PktMon support in TCPIP — The cross-component network diagnostics tool for Windows now has TCPIP support providing visibility into the networking stack. PktMon can be used for packet capture, packet drop detection, packet filtering and counting for virtualization scenarios, like container networking and SDN.

(Improved) RSC in the vSwitch

RSC in the vSwitch has been improved for better performance. First released in Windows Server 2019, Receive Segment Coalescing (RSC) in the vSwitch enables packets to be coalesced and processed as one larger segment upon entry in the virtual switch. This greatly reduces the CPU cycles consumed processing each byte (Cycles/byte).

However, in its original form, once traffic exited the virtual switch, it would be re-segmented for travel across the VMBus. In Windows Server vNext, segments will remain coalesced across the entire data path until processed by the intended application. This improves two scenarios:

– Traffic from an external host, received by a virtual NIC

– Traffic from a virtual NIC to another virtual NIC on the same host

These improvements to RSC in the vSwitch will be enabled by default; there is noo action required on your part.

Direct Server Return (DSR) load balancing support for Containers and Kubernetes

DSR is an implementation of asymmetric network load distribution in load balanced systems, meaning that the request and response traffic use a different network path. The use of different network paths helps avoid extra hops and reduces the latency by which not only speeds up the response time between the client and the service but also removes some extra load from the load balancer.

Using DSR is a transparent way to achieve increased network performance for your applications with little to no infrastructure changes. More information

Introducing Virtual Machine (Role) Affinity/AntiAffinity rules with Failover Clustering

In the past, we have relied on the group property AntiAffinityClassNames to keep roles apart, but there was no site-specific awareness.  If there was a DC that needed to be in one site and a DC that needs to be in another site, it wasn’t guaranteed.  It was also important to remember to type the correct AntiAffinityClassNames string for each role.

There are these PowerShell cmdlets:

• New-ClusterAffinityRule = This allows you to create a new Affinity or AntiAffinityrule.  There are four different rule types (-RuleType)

• DifferentFaultDomain = keep the groups on different fault domains
• DifferentNode = keep the groups on different nodes (note could be on different or same fault domain)
• SameFaultDomain = keep the groups on the same fault domain
• SameNode = keep the groups on the same node

• Set-ClusterAffinityRule = This allows you to enable (default) or disable a rule

• Add-ClusterGroupToAffinityRule = Add a group to an existing rule

• Get-ClusterAffinityRule = Display all or specific rules

• Add-ClusterSharedVolumeToAffinityRule = This is for storage Affinity/AntiAffinity where Cluster Shared Volumes can be added to current rules

• Remove-ClusterAffinityRule = Removes a specific rule

• Remove-ClusterGroupFromAffinityRule = Removes a group from a specific rule

• Remove-ClusterSharedVolumeFromAffinityRule = Removes a specific Cluster Shared Volume from a specific rule

• Move-ClusterGroup -IgnoreAffinityRule = This is not a new cmdlet but does allow you to forcibly move a group to a node or fault domain that otherwise would be prevented.  In PowerShell, Cluster Manager, and Windows Admin Center, it would show that the group is in violation as reminder.

Now you can keep things together or apart.  When moving a role, the affinity object ensures that it can be moved.  The object also looks for other objects and verifies those as well, including disks, so you can have storage affinity with virtual machines (or Roles) and Cluster Shared Volumes (storage affinity) if desired.  You can add roles to multiples such as Domain controllers, for example.  You can set an AntiAffinity rule so that the DCs remain in a different fault domain.  You can then set an affinity rule for each of the DCs to their specific CSV drive so they can stay together.  If you have SQL Server VMs that need to be on each site with a specific DC, you can set an Affinity Rule of same fault domain between each SQL and their respective DC.  Because it is now a cluster object, if you were to try and move a SQL VM from one site to another, it checks all cluster objects associated with it.  It sees there is a pairing with the DC in the same site.  It then sees that the DC has a rule and verifies it.  It sees that the DC cannot be in the same fault domain as the other DC, so the move is disallowed.

There are built-in overrides so that you can force a move when necessary.  You can also easily disable/enable rules if desired, as compared to AntiAffinityClassNames with ClusterEnforcedAffinity where you had to remove the property to get it to move and come up.  We also have added functionality in Drain where if it must move to another domain and there is an AntiAffinity rule preventing it, we will bypass the rule.  Any rule violations are exposed in both Cluster Admin as well as Windows Admin Center for your review.

Flexible BitLocker Protector for Failover Clusters

BitLocker has been available for Failover Clustering for quite some time. The requirement was the cluster nodes must be all in the same domain as the BitLocker key is tied to the Cluster Name Object (CNO). However, for those clusters at the edge, workgroup clusters, and multidomain clusters, Active Directory may not be present. With no Active Directory, there is no CNO. These cluster scenarios had no data at-rest security. Starting with this Windows Server Insiders, we introduced our own BitLocker key stored locally (encrypted) for cluster to use. This additional key will only be created when the clustered drives are BitLocker protected after cluster creation.

New Cluster Validation network tests

Networking configurations continue to get more and more complex. A new set of Cluster Validation tests have been added to help validate the configurations are set properly. These tests include:

• List Network Metric Order (driver versioning)
• Validate Cluster Network Configuration (virtual switch configuration)
• Validate IP Configuration Warning
• Network Communication Success
• Switch Embedded Teaming Configurations (symmetry, vNIC, pNIC)
• Validate Windows Firewall Configuration Success
• QOS (PFC and ETS) have been configured

(Note regarding QOS settings above: This does not imply that these settings are valid, simply that settings are implemented. These settings must match your physical network configuration and as such, we cannot validate that these are set to the appropriate values)

Server Core Container images are 20 percent smaller

In what should be a significant win for any workflow that pulls Windows containers images, the download size of the Windows Server Core container Insider image has been reduced by 20%. This has been achieved by optimizing the set of .NET pre-compiled native images included in the Server Core container image. If you are using .NET Framework with Windows containers, including Windows PowerShell, use a .NET Framework image, which will include additional .NET pre-compiled native images to maintain performance for those scenarios, while also benefitting from a reduced size.

What’s new with the SMB protocol

Raising the security bar even further, SMB now supports AES-256 Encryption.  There is also increased performance when using SMB encryption or signing with SMB Direct with RDMA enabled network cards.  SMB now also has the ability to do compression to improve network performance.

Available Content

• Windows Server vNext Long-Term Servicing Channel Preview is available in ISO format in 18 languages, and in VHDX format in English only. The following keys allow for unlimited activations:

• Standard: MFY9F-XBN2F-TYFMP-CCV49-RMYVH
• Datacenter: 2KNJJ-33Y9H-2GXGX-KMQWH-G6H67

• Windows Server vNext Semi-Annual Preview The Server Core Datacenter and Standard Editions are available in the 18 supported Server languages in ISO format and in VHDX format in English only. The following keys allow for unlimited activations:

• Standard: V6N4W-86M3X-J77X3-JF6XW-D9PRV
• Datacenter: B69WH-PRNHK-BXVK3-P9XF7-XD84W

• Windows Server Core App Compatibility FoD Preview
• Microsoft Server Operating System Language Packs

Keys are valid for preview builds only. After activation for the preview keys is disabled, you may still install and use preview builds for development and testing purposes without activating.

• Symbols are available on the public symbol server – see Update on Microsoft’s Symbol Server blog post and Using the Microsoft Symbol Server.
• Containers: For more information about how to obtain and install Windows Server containers and Insider builds, click here.  Quick start information, here.

These previews expire January 31 , 2021.

How to Download

Registered Insiders may navigate directly to the Windows Server Insider Preview download page.  See the Additional Downloads dropdown for Windows Admin Center and other supplemental apps and products. If you have not yet registered as an Insider, see GETTING STARTED WITH SERVER on the Windows Insiders for Business portal.

We value your feedback!

The most important part of a frequent release cycle is to hear what’s working and what needs to be improved, so your feedback is extremely valued. For Windows Server, use your registered Windows 10 Insider device and use the Feedback Hub application. In the app, choose the Windows Server category and then the appropriate subcategory for your feedback. In the title of the Feedback, please indicate the build number you are providing feedback as shown below:

[Server #####] Title of my feedback

See Share Feedback on Windows Server via Feedback Hub for specifics. We also encourage you to visit the Windows Server Insiders space on the Microsoft Tech Communities forum to collaborate, share and learn from experts.

For Windows Admin Center, Send us feedback via UserVoice. We also encourage you to visit the Windows Admin Center space on the Microsoft Tech Communities.

Diagnostic and Usage Information

Microsoft collects this information over the internet to help keep Windows secure and up to date, troubleshoot problems, and make product improvements. Microsoft server operating systems can be configured to turn diagnostic data off, send Required diagnostic data, or send Optional diagnostic data. The default setting is to send Required diagnostic data. Required diagnostic data includes information to help keep the device secure, up-to-date, and working as expected.  During previews, Microsoft asks that you change this setting to Enhanced in order to provide the best automatic feedback and help us improve the final product.

Administrators can change the level of information collection through Settings. For details, see http://aka.ms/winserverdata. Also see the Microsoft Privacy Statement.

Terms of Use

This is pre-release software – it is provided for use “as-is” and is not supported in production environments. Users are responsible for installing any updates made available from Windows Update.   All pre-release software made available to you via the Windows Server Insider program are governed by the Insider Terms of Use.

Thanks,
BLB

Первая ознакомительная техническая версия Windows 10 и ознакомительная техническая версия Windows Server vNext стали доступны пользователям одновременно. Это обоснованный ход. Для большинства из нас он был ожидаемым, ведь Windows Server 2012, Windows Server 2012 R2 и другие версии Windows Server появлялись одновременно с выпуском очередной клиентской версии Windows.

Недавно было объявлено, что выпуск Windows Server vNext последует за выпуском клиента Windows 10. По некоторым сообщениям, между этими событиями пройдет по крайней мере шесть месяцев. Впрочем, интервал между выпусками клиентского и серверного продуктов может быть и более длительным. Насколько целесообразно одновременно выпускать клиентскую и серверную операционные системы с точки зрения предприятий — спорный вопрос.

Напомню, что Windows Vista была выпущена в январе 2007 года, а версия Windows Server 2008 появилась годом позже. Применение Windows Vista в среде Windows Server 2008 в компаниях было гораздо более успешным, нежели Windows Vista в среде Windows Server 2003. Организации, внедрявшие Windows Vista, столкнулись с рядом препятствий, связанных с усовершенствованной моделью безопасности, вызвавшей проблемы совместимости с большим числом приложений, уязвимых с точки зрения безопасности, но все же работавших с Windows XP. Но возникает вопрос, не был бы прием Vista несколько более теплым, если бы все компоненты, которые стали доступными с выпуском Windows Server 2008, имелись в наличии при появлении клиентской операционной системы в январе 2007 года?

Вспомните, что Windows 7 приняли гораздо лучше, хоть она и не имела значительных отличий от Vista, подобных отличиям Vista от XP. Окончательная версия (RTM) Windows 7 появилась в июле 2009 года. RTM-версия Windows Server 2008 R2 была выпущена в тот же день. Таким образом, администраторы могли немедленно воспользоваться всеми функциями Windows 7, если развертывали Windows Server 2008 R2 одновременно с клиентской операционной системой.

Конечно, нельзя забывать, что Windows 8 и Windows Server 2012 были выпущены одновременно, так же как Windows 8.1 и Windows Server 2012 R2. У одновременного выпуска клиентского и серверного продуктов есть свои преимущества, но успех внедрения операционной системы зависит от многих факторов.

Шумиха вокруг Windows 10 означает, что операционную систему, вероятно, ждет более теплый прием, чем Windows Vista и Windows 8. Говорят, что некоторые важные функции Windows 10 будут доступны лишь с появлением следующей версии Windows Server. На самом деле интерес к Windows 10 уже достаточно велик и вряд ли нужны дополнительные усилия, чтобы стимулировать начальное внедрение.

Хочу заметить, что даже при выпуске серверной операционной системы одновременно с клиентской компании не обновляют свою серверную инфраструктуру так же часто, как клиентскую часть. Большинство компаний, работающих с Windows Server, все еще не перешли на Windows Server 2012 или Windows Server 2012 R2. Даже если следующая версия Windows Server будет выпущена одновременно с Windows 10, результаты ее внедрения на предприятиях вряд ли будут особо впечатляющими.

Преимущества одновременного выпуска клиентских и серверных операционных систем будут заметны, если только следующая версия Server не окажется необходимой для использования очень многих возможностей Windows 10 (по-моему, так и будет, но это лишь мое предположение).

Windows Server vNext: гигантский скачок вместо очередного шага?

При появлении Server 2012 R2 подразумевалось, что выпуск продуктов Microsoft продолжится в новом ритме. Нам больше не придется по три года ждать «революционной» версии Server, и выпуски станут более частыми и «эволюционными». Именно такой взгляд преобладал, когда мы впервые услышали о Windows 10. Разрабатываемая Windows 10 располагала новыми функциональными возможностями, но степень их новизны указывала скорее на эволюцию Windows 8.1. Ознакомительная техническая версия для Windows Server, как уже говорилось, была выпущена одновременно с ознакомительной технической версией Windows 10.

В декабре я подготовил курс «Windows Server vNext First Look» («Первый взгляд на Windows Server vNext»). Мне пришлось изучить ознакомительную техническую версию Server vNext и всю информацию, опубликованную на сайте TechNet и представленную на конференции TechEd Europe, чтобы попытаться выяснить, в чем заключались новшества следующей версии Windows Server.

Когда курс был готов, я пришел к выводу, что версия Windows Server vNext располагает рядом превосходных функций и была логическим эволюционным шагом после Windows Server 2012 R2. Улучшения в Hyper-V, отказоустойчивая кластеризация и Storage Replica заслуживают внимания и заставляют задуматься о том, чтобы отдать новой серверной операционной системе (когда она будет готова) предпочтение перед Windows Server 2012 R2, уже имеющей хорошую репутацию. Как и многие другие, я ожидал, что ознакомительная техническая версия будет усовершенствована перед выходом окончательного продукта, готовящегося к выпуску одновременно с Windows 10.

В начале февраля было объявлено, что выпуск Windows Server vNext одновременно с Windows 10 не состоится. Windows Server vNext должна появиться в начале следующего года. После экспериментов с ознакомительной технической версией у меня, возможно, безосновательно, появились определенные ожидания относительно компонентов продукта. Но меня ждал сюрприз. Конечно, есть возможности, которых не было в ознакомительной технической версии — такие как функциональные уровни доменов Windows Server vNext, обеспечивающие, в частности, срок членства в группе (таким образом членство учетных записей сохраняется лишь в течение ограниченного периода времени). Однако в результате бесед на конференции TechEd Europe у меня сложилось впечатление, что реализация всей функциональности, ставшей предметом обсуждения, но отсутствовавшей в продукте — дело лишь нескольких обновлений. Очевидно, все обстоит не совсем так.

Положение значительно прояснилось после вступительного доклада Джеффри Сновера и Рика Клауса на конференции TechDays. Его можно найти по адресу: http://channel9.msdn.com/events/Future-Decoded-Tech-Day-2014/TechDays-Online-2015/Microsoft-Corporate-Keynote-and-Interview-Jeffrey-Snover.

Мне стало понятно, что Server vNext — не очередной шаг вперед, а гигантский скачок. При поверхностном взгляде Server vNext может выглядеть очень похоже на Windows Server 2012 R2 (по крайней мере, в ознакомительной технической версии), но во внутренних структурах произошли почти радикальные изменения.

Так, я обратил внимание на то, что технология «Контейнеры» охватывает как сам серверный продукт, так и оптимизированный для «облака» сервер. Насколько я понял из комментария Сновера, будет реализовано два профиля приложений:

• приложения, ориентированные на существующие API-интерфейсы, они будут взаимодействовать с сервером;
• приложения могут быть ориентированы на подмножество этих API-интерфейсов, предоставленных оптимизированным для «облака» сервером.

Сновер также отметил, что клиентская операционная система отделена от серверной, и пояснил, почему раньше не существовало больших различий между клиентом и сервером (вспомните об изменении раздела реестра в Windows NT). На данный момент мы видим некоторые части мозаики, но благодаря сведениям, представленным на других конференциях, сможем увидеть не только картину целиком, но и понять, как все элементы подогнаны друг к другу.

In this article, I describe how to install Windows Server 2025 for testing. The newest vNext Preview gives us an exclusive look at what’s to come in Windows Server 2025. These previews are of new server operating systems and even new features added to older versions. Even though Windows Server 2022 is still in the box, it’s clear that this release shows the direction Microsoft will take with the next version of its server operating system. Take a look at this new sample build to get a feel for what Windows Server 2025 has in store.

Let’s take a look at the new features that will be in Windows Server 2025. Visit the official Microsoft docs for full information on all the new features and improvements.

System Requirement for Windows Server 2025

To learn more details regarding the system requirements for servers, please visit the Microsoft website.

Download Microsoft Server vNext 2025

The Windows Server Preview is downloadable in ISO format in various languages and in VHDX format exclusively in English. Specialized versions, such as the Windows Server Datacenter Azure Edition, expand the range of available options.

The most recent version of Windows Server Insider Preview is available for download at this link:

Download Windows Server Insider Preview.

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Install Windows Server 2025

After downloading the Windows Server 2025 ISO image, you will mount it and install it as per normal ISO installation on a virtual machine or on a physical system. I am installing this in VMware Workstation 17.5.

Press a key to boot from…

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Windows Server Setup
Select the language
Time and currency format
Select the keyboard or input method and click next.

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Click Install now

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On the active Windows server screen, you will be asked to enter the Windows Server 2025 product key. Type the key, and then choose next. Or I don’t have a product key.

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Available versions of Windows Server VNext 2025

Windows Server 2022 Standard
Windows Server 2022 Standard (Desktop Experience)
Windows Server 2022 Datacenter
Windows Server 2022 Datacenter (Desktop Experience)
I am going to install Windows Server 2025 Standard (Desktop Experience).

Click next.

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Click next after accepting the license terms.

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Choose what type of installation to choose; we will go with custom as I am doing a clean Windows Server VNext 2025 installation with no existing operating system.

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Select the partition and choose next.

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The server 2025 installation is now starting. Your Windows Server VNext 2025 will reboot a couple of times to complete the installation.

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Choose to restart now.

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Before you sign into Windows Server 2025, you need to set the administrator password. type a unique password for your Windows server and click Finish.

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Type the newly created password and hit enter.

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Windows Server 2025 desktop.

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Also, read this article: How to Install Active Directory on Server 2025.

Learn more: How to Enable Telnet in Windows Server.