BSOD (0x7E) caused by Netwtw12.sys on multiple Intel AX211 devices in enterprise Wi-Fi environment

[SAISAI3110]

Hello, we experienced a major issue this morning in our enterprise Wi-Fi environment.
More than 20 PCs equipped with Intel AX211 suddenly crashed with a BSOD.

We would like Intel’s technical guidance on this issue.

■ Environment

Client devices

• Wireless adapter: Intel AX211

• Driver version: 22.230.0.8

• OS: Windows 11

Access Points (Enterprise)

• Vendor: Extreme Networks

• Model: AP305C

• Bands: 2.4GHz / 5GHz (Wi-Fi 6 / 802.11ax)

• Channel width: 160MHz (possible)

• Features enabled: 802.11r, 802.11k, 802.11v

• DFS channels may be used

Other APs nearby

• A NURO Wi-Fi 6E router (6GHz capable) is present in the same area
  (we suspect its 6GHz/160MHz management frames may also affect the AX211 driver behavior)

---

■ Symptoms

• BSOD BugCheck: 0x7E – SYSTEM_THREAD_EXCEPTION_NOT_HANDLED

• Faulting module (from Microsoft crash dump analysis): Netwtw12.sys

• Event Log (System): Netwtw12 – Event ID 6062 (“driver hang”) recorded repeatedly

• More than 20 PCs crashed at nearly the same time this morning.

■ What we want to understand

1. Are there known issues in recent Intel AX211/AX201 drivers relｇated to 160MHz, DFS, or roaming (802.11r/k/v) on enterprise APs?

2. Could receiving or scanning 6GHz management frames from nearby Wi-Fi 6E routers trigger Netwtw12.sys exceptions?

3. Are there recommended “stable” driver versions for AX211 in enterprise environments?

4. Has Intel confirmed any internal bug for Netwtw12.sys resulting in BugCheck 0x7E or repeated 6062 driver hang events?

We appreciate any assistance or analysis from Intel engineers.
Thank you.

[KennethB_Intel]

Hello SAISAI3110,

Thank you for reaching out to Intel Community Forum. I understand that you are experiencing BSOD issues related to Netwtw12.sys on multiple Intel AX211 devices in your enterprise Wi-Fi environment. To assist you further, please provide answers to the following questions:

• Are you experiencing issues with Wi-Fi only, or both Wi-Fi and Bluetooth?
• When did the issue first start, and has it occurred before today?
• Did this issue begin after a recent OS update or wireless driver update?
• Have you tried rolling back to a previous driver version for testing?
• What steps do you take to reproduce the issue? Is it random or consistent?
• Were the systems able to maintain normal wireless performance before this incident?
• Have you installed any recent software or hardware changes on these systems?
• Are these laptops or desktop systems?
• Is the Intel AX211 adapter the original one that came pre-installed, or was it replaced recently?
• Have you checked if the issue occurs on different networks or only in this enterprise environment?
• Can you reproduce the issue when using a wired (hardwired) connection?
• Have you rebooted your access points or network equipment since the issue occurred?
• Did you make any changes to Wi-Fi adapter settings before the issue started?

We will wait for your response so we can continue assisting you.

Best regards,

Kenneth B.

Intel Customer Support Technician

[SAISAI3110]

Hello Kenneth,

After further detailed verification of our wireless environment,
I would like to provide a consolidated set of important corrections to the information I previously shared.

1. Channel width

I originally stated that the channel width was 160 MHz.
This was incorrect.

→ The actual channel width is 20 MHz.
Therefore, the BSOD issue is not related to 160 MHz operation.

2. Roaming features (802.11r / 802.11k / 802.11v)

I previously assumed these might be enabled.
After reviewing the configuration, I confirmed:

→ 802.11r, 802.11k, and 802.11v are all disabled.

No fast transition or assisted roaming features were active.

3. About the NURO Wi-Fi router

I suspected interference from a nearby NURO Wi-Fi 6E router.
This was also incorrect.

→ There is no separate NURO AP, and therefore no 6 GHz management frames involved in this issue.

4. Role of the AP305C

The AP305C is an access point only, not an ONU or router.

The actual network structure is:

• ONU (provided by NURO): separate device

• Router: separate device

• PoE switch: separate device

• AP305C: powered and connected via the PoE switch

So the AP305C does not contain router or ONU functions internally.

5. Correct wireless environment summary

• AP: Extreme Networks AP305C (access point only)

• Band: 5 GHz

• Channel width: 20 MHz

• 802.11r: disabled

• 802.11k: disabled

• 802.11v: disabled

• WPA2-Enterprise (details can be provided if needed)

• Affected devices: laptops with Intel AX211

• BSOD details: BugCheck 0x7E, Netwtw12.sys, Event ID 6062

• Issue occurred this morning on 20+ devices simultaneously

• Cannot be reproduced with a single device (likely linked to multiple clients or roaming load)

Please proceed with your investigation using this corrected and consolidated information.
Thank you very much for your continued support.

Best regards,
SAISAI3110

[SAISAI3110]

Hello Kenneth,

Here are my answers to your questions:

 Are you experiencing issues with Wi-Fi only, or both Wi-Fi and Bluetooth?

→ Wi-Fi only. Bluetooth is working normally without any issues.

 When did the issue first start, and has it occurred before today?

→ The issue first started on the morning of November 18.
It had never occurred before, and from the evening of November 18 onward the issue has not reoccurred.

 Did this issue begin after a recent OS update or wireless driver update?

→ No. There were no OS updates or wireless driver updates applied immediately before the issue occurred.

 Have you tried rolling back to a previous driver version for testing?

→ We did not perform a rollback.
Updating to a newer driver version caused the issue to stop occurring, but we cannot determine whether the improvement was due to the update itself or due to a change in environmental conditions after the original incident.

 What steps do you take to reproduce the issue? Is it random or consistent?

→ The BSOD occurred simply by booting the PC in the affected location.
No special actions were required.
When attempting to reproduce it later, the issue did not occur again, so it seems environment-dependent rather than consistently reproducible.

 Were the systems able to maintain normal wireless performance before this incident?

→ Yes. Wireless performance had been normal with no issues before this event.

 Have you installed any recent software or hardware changes on these systems?

→ No, there were no software or hardware changes.

 Are these laptops or desktop systems?

→ They are laptops.

 Is the Intel AX211 adapter the original pre-installed adapter, or was it replaced recently?

→ It is the original pre-installed adapter.
No replacement has been made.

 Have you checked if the issue occurs on different networks or only in this enterprise environment?

→ The issue occurs only on this enterprise Wi-Fi network.
Other environments with the same model PCs and same wireless equipment do not experience the issue.

 Can you reproduce the issue when using a wired (hardwired) connection?

→ No. The issue cannot be reproduced on a wired connection.

 Have you rebooted your access points or network equipment since the issue occurred?

→ We did not reboot the equipment.
Even without rebooting, the issue has stopped occurring.

 Did you make any changes to Wi-Fi adapter settings before the issue started?

→ No, we made no changes.
All systems were using the default Intel adapter settings.

If you need additional logs, dumps, or configuration details, we can provide them.

Best regards,
SAISAI3110

[KennethB_Intel]

Hello SAISAI3110,

Thank you for your response. Please follow the steps below to help resolve the issue:

Step 1: Laptop Cold Reboot

For laptops with a removable battery:

1. Turn off the laptop and unplug the power cord.
2. Disconnect any peripheral devices and remove the computer from any docking station.
3. Remove the battery from the computer.
4. With the battery and power cord unplugged, press and hold the Power button for approximately 15 seconds.
5. After draining the capacitors, re-insert the battery and plug in the power cord. Leave peripheral devices disconnected.
6. Turn on the laptop.

For laptops with a non-removable battery:

1. Turn off the laptop.
2. Disconnect the AC adapter.
3. Disconnect all nonessential peripheral devices (printers, scanners, external drives, USB flash drives).
4. With the AC adapter unplugged, press and hold the Power button for approximately 15 seconds.
5. Reconnect the AC adapter and turn on the computer.

Step 2: Clean Installation of Wireless Driver (if issue persists)

• Download the latest wireless driver from your computer manufacturer or the Intel website.
• Uninstall the current Wi-Fi driver via Device Manager:
  • Expand Network Adapters.
  • Right-click the Intel Wireless Adapter.
  • Select Uninstall and check Delete the driver software for this device.
  • Repeat until the delete option is greyed out.
• Restart the computer after uninstalling.
• Install the downloaded driver by right-clicking and selecting Run as administrator.
• (Optional) Apply recommended wireless settings for better connectivity.
• If Intel® PROSet/Wireless Software is installed:
  • Uninstall it from Control Panel > Programs and Features.
  • Choose to discard settings when prompted.

Please let me know if these steps resolve the issue or if you need further assistance.

Best regards,

Kenneth B.

Intel Customer Support Technician

[KennethB_Intel]

Hello SAISAI3110,

I hope you were able to try the troubleshooting steps I provided earlier. Please let me know the outcome so I can determine the next steps to assist you further.

Best regards,

Kenneth B.

Intel Customer Support Technician

[KennethB_Intel]

Hello SAISAI3110,

As there has been no response, I will now close this case. Should you need additional support, please feel free to open a new inquiry. This thread will no longer be monitored moving forward.

Best regards,

Kenneth B.

Intel Customer Support Technician