Unable to connect to SMB1 NAS drives with NET USE after KB5065429/KB5065426 updates — by IGYQ on Microsoft Q&A

intermediateforumLink only (©)Windows 10 KB5065429 and Windows 11 KB5065426

A thread about a legacy NAS that stopped mapping after the September 2025 Windows cumulative updates. The answer explains the client now rejects SMB1 negotiation, offers re-enabling the SMB1 client as a not-recommended workaround, and advises updating the NAS firmware to SMB2/3. A second reply says Microsoft has begun blocking even manual re-enabling, and the original poster's NAS had no newer firmware, so replacing it may be the only fix.

Quick steps

Preferred: update the NAS firmware to enable SMB2/3
Not recommended: Enable-WindowsOptionalFeature -Online -FeatureName SMB1Protocol-Client -All, then reboot

Paraphrased from the source. Menus can differ by version, so check the original for full details.

Read the full thread on learn.microsoft.com

Source: Unable to connect to SMB1 NAS drives with NET USE after KB5065429/KB5065426 updates by IGYQ on Microsoft Q&A. Licence: Link only (©).

Source reviewed: 2026-11-02
Link checked: 2026-11-02
Tested hands-on: Not by Oddbyte.Me

smb1nasnet usewindows update

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