# Allow insecure guest logons (Win11 blocks Guest by default)
Set-SmbClientConfiguration -EnableInsecureGuestLogons $true -Force
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# Also set the policy value (covers more cases)
New-Item -Path 'HKLM:\SOFTWARE\Policies\Microsoft\Windows\LanmanWorkstation' -Force | Out-Null
New-ItemProperty -Path 'HKLM:\SOFTWARE\Policies\Microsoft\Windows\LanmanWorkstation' `
-Name 'AllowInsecureGuestAuth' -PropertyType DWord -Value 1 -Force | Out-Null
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# Restart the Workstation service (often enough; reboot if it still refuses)
Restart-Service LanmanWorkstation -Force
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# Allow legacy servers that don't do SMB signing properly (common in Win11 24H2)
Set-SmbClientConfiguration -RequireSecuritySignature $false -Force
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# If your share is GUEST/anonymous (only if needed)
Set-SmbClientConfiguration -EnableInsecureGuestLogons $true -Force
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# Optional: make sure encryption isn't being forced
Set-SmbClientConfiguration -RequireEncryption $false -Force
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Get-SmbClientConfiguration | Select EnableInsecureGuestLogons,RequireSecuritySignature,RequireEncryption