Windows Server · 2025 · Release · Out-of-band update
September 22, 2025— KB5068221 (OS Build 26100.6588) Out-of-band
- Release
- Cumulative update
- KB5068221 — Microsoft's article, opens in a new tab
Windows Server 2025: Current LTSC release
Microsoft's known issues — KB5068221
- Issue Known issue After installing the Windows update released on or after September 9, 2025, you might fail to connect to shared files and folders using the Server Message Block (SMB) v1 protocol on NetBIOS over TCP/IP ( NetBT ). This issue can occur if either the SMB client or the SMB server has the September 2025 security update installed. Note: The SMBv1 protocol is deprecated and no longer installed by default in modern versions of Windows and Windows Server. Deployments that use newer versions of the protocol, SMBv2 or SMBv3 , are not affected by this problem. Active Directory domain controllers (DC) running on Windows Server 2025 and also running the schema master Flexible Single Master Operation (FSMO Workaround: This issue is addressed in KB5066835 . This issue is addressed KB5068861 . This issue is addressed in KB5068861 .
Known issues — reported on the forum
In the news
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- Coverage Windows 11 Password Sign‑in Icon Missing After August 2025 Preview Update — Fixes and Workarounds
- Fix KB5065790 Windows 11 23H2 Preview: Reliability Fixes Ahead of EOL
- Fix Windows 11 KB5068221: App-V Office fix and SMBv1 caveat
- Issue Windows 11 KB5065790 Preview: Fixes Sign-In Freeze RDP Docking SMBv1 NetBT
- Issue Windows 11 24H2 OOB KB5068221 Fixes App-V Office Crashes (Build 26100.6588)
- Fix KB5068221 OOB Update Fixes Office Stability in App-V on Windows 11 24H2
Discussed on the forum
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