Resolving Wireless Connection Issue Caused by Microsoft Update 10/2026

Microsoft's October Cumulative Patch is breaking wireless authentication for some domain-joined systems. The correction is a registry update followed by a reboot. This article lists the steps to do this update as well as how to confirm it has been applied.

Issue

A Xavier domain-joined Windows 11 system cannot connect to Xavierwireless. Credentials are verified to be correct and account status is verified to be active. The system simply states it cannot connect to the network when attempting to connect to Xavierwireless.

Causes

Microsoft made a significant change to the security settings and methodology used in wireless connections in the October patching cycle. This configuration change can potentially cause a domain-joined machine to fail to connect to Xavierwireless. In cases where this security settings change has caused a disruption, the steps below can restore connectivity.

Resolution

To resolve this issue:

1. Type cmd into the Search field on the Windows Taskbar
2. You should be offered Command Prompt as a choice; look to the right column and click Run As Administrator
3. If Prompted, click Yes to agree to open as Administrator
4. Paste the following string (below) into the Command Prompt window:
   reg add "HKLM\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0" /v BlockNtlmv1SSO /t REG_DWORD /d 0 /f
5. Hit Enter after pasting that value
6. You should see the response "The operation completed successfully"
7. Close Command Prompt and reboot the computer

Further Diagnostic Information

To confirm the setting has been applied:

1. Type cmd into the Search field on the Windows Taskbar
2. You should be offered Command Prompt as a choice; look to the right column and click Run As Administrator
3. If Prompted, click Yes to agree to open as Administrator
4. Paste the following string (below) into the Command Prompt window:
   reg query "HKLM\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0" /v BlockNtlmv1SSO
5. Hit Enter after pasting that value
6. You should see the response:
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0
       BlockNtlmv1SSO    REG_DWORD    0x0
7. This indicates the BlockNtlmv1SSO value was set to 0
8. If you see this response, please close Command Prompt
9. This is the correct value. If the system is not connecting to Xavierwireless please reboot. If it continues to fail, please contact the Service Desk at 513-745-4357