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Problems with Windows 11 Pro Update to 25H2

Joachim Claus 5 Reputation points
2025-10-05T15:15:00.08+00:00

I have 2 desktop workstations and one mobile workstation, all running Windows 11 Pro. All three computers are connected to a LAN, and can use shared files between each other.

Since I have update all three computers to build 26200.6725, the two desktop workstation cannot communicate to each other via LAN, while communication between the mobile workstation and the two desktop workstation runs fluently, as before the update. The mobile workstation can access both desktop workstations and vice versa over my LAN.

I have compared al network settings of the three W11 Pro systems, and all show the same parameter settings.

What could be the reason, that the two desktop workstation cannot share files between each other over the LAN. If I try to connect to the other desktop workstation I get a network failure (see screenshot)?

Can someone help?

Joachim

Windows Network failure message

Windows for business | Windows Client for IT Pros | Networking | Network connectivity and file sharing
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  1. Joseph Tran 4,080 Reputation points Independent Advisor
    2025-10-05T15:56:19.5266667+00:00

    Hi, There

    It looks like the update to Windows 11 build 26200.6725 broke SMB authentication between your two desktop PCs. The error means they’re rejecting each other’s login, likely due to new NTLM/SMB security changes in that build.

    Can you try this out and let me know the result:

    1. Use matching local accounts on both PCs (same username + password). When connecting, type HDWS4\Joachim instead of just Joachim.

    2. Open secpol.msc > Local Policies > Security Options

    • Set “LAN Manager authentication level” > Send NTLMv2 response only.
    • Temporarily uncheck “Require 128-bit encryption” under NTLM SSP options.

    3. In gpedit.msc > Network > Lanman Workstation, enable Insecure guest logons just for testing.

    4. Clear old credentials in Control Panel > Credential Manager.

    1. Run these in PowerShell as Admin:
    Set-SmbServerConfiguration -RequireSecuritySignature $false -Force
net use * /delete /y

    => Then restart both desktops and try again.

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  2. Joachim Claus 5 Reputation points
    2025-10-10T10:46:49.3466667+00:00

    Hallo Joseph,

    I have studied many contributions to this issue with no positive results.

    I have found, that "net view //HDWS4/" from HDWS3 results in system error 5 and Access denied".

    The same in the direction from HDWs3 to HDWS4.

    With the Laptop (also on W11 25H2) a can access both workstations and have access to shared disks.

    Also from he workstations a have access to the Laptop (MWS02).

    Any idea how to solve thsis?

    Regards

    Joachim

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  3. Joachim Claus 5 Reputation points
    2025-10-08T11:51:39.0133333+00:00

    Hallo Joseph,

    I have made an additioal test. I have booted workstation "HDWS4" with a USB-SSD copy of my win 11 24H2 system.

    With this system I could access all connected Computers, i.e. MWS02 and HDWS3.

    From workstation "HDWS3" (which runs W11 25H2) I could also access the two other computers (MWS02 and HDWS4).

    So with this result, it is definitely an issue with W11 25H2 when the two workstations both run W11 25H2.

    May be this helps you to find a reasn and a solution.

    Joachim

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  4. Joachim Claus 5 Reputation points
    2025-10-07T08:58:26.4766667+00:00

    Hi Joseph,

    I have started workstation HDWS4 in secure mode with network features. No success to access workstation HDWS3.

    Joachim

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  5. Joachim Claus 5 Reputation points
    2025-10-06T05:55:37.8266667+00:00

    Hi Joseph,

    first of all, thank you for your answer.

    I followed all steps on both workstations. However, I still have no connections between these two workstations.

    Shall I set the changed values in secpol.msc and gpedit.msc to their former values?

    Joachim

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