Microsoft has released the latest Windows Server 2025 preview build for members of the Windows Server Insider Program. The new 26277 version adds one known issue in its change log but no new features.
Microsoft has released the latest Windows Server build for members of the Windows Server Insider Program. The new build number is 26277 and is the same build number for the just-released Windows 11 Canary Channel build. Keep in mind that this and future Windows Server Insider builds now have the Windows Server 2025 branding.
This appears to be a minor update as the change log is nearly identical to the one that was posted for the last preview build 26212, The one change is a new known bug that states some users may encounter boot issus with creating secure-boot Gen 2 VMs. Here is the full change log:
What’s New
[NEW] Delegated Managed Service Accounts (dMSA)
A new account type known as delegated Managed Service Account (dMSA) is now available that allows migration from a traditional service account to a machine account with managed and fully randomized keys, while disabling original service account passwords. Authentication for dMSA is linked to the device identity, which means that only specified machine identities mapped in AD can access the account. Using dMSA helps to prevent harvesting credentials using a compromised account (kerberoasting), which is a common issue with traditional service accounts.
To learn more about dMSA, visit https://learn.microsoft.com/en-us/windows-server/security/delegated-managed-service-accounts/delegat….
More Server Message Block (SMB) protocol changes.
Starting with Build 26097 and higher, we are introducing the following Server Message Block (SMB) protocol changes for QUIC, signing, and encryption:
SMB over QUIC client and server disable: Administrators can now disable the SMB over QUIC client and SMB over QUIC server options with Group Policy and PowerShell.
SMB over QUIC client and server connection auditing: Successful SMB over QUIC client and SMB over QUIC server connection events are now written to the event log to include the QUIC transport.
