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• Dell Wireless Wlan Card Utility
• Laptop Wlan Card
• Wlan Network Adapter Download
• Dell Wireless Wlan Card Driver
• Wlan Network Driver Free Download

Note

Home users: This article is intended for use by support agents and IT professionals. If you're looking for more general information about Wi-Fi problems in Windows 10, check out this Windows 10 Wi-Fi fix article.

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Overview

This is a general troubleshooting of establishing Wi-Fi connections from Windows clients.Troubleshooting Wi-Fi connections requires understanding the basic flow of the Wi-Fi autoconnect state machine. Understanding this flow makes it easier to determine the starting point in a repro scenario in which a different behavior is found.This workflow involves knowledge and use of TextAnalysisTool, an extensive text filtering tool that is useful with complex traces with numerous ETW providers such as wireless_dbg trace scenario.

Scenarios

This article applies to any scenario in which Wi-Fi connections fail to establish. The troubleshooter is developed with Windows 10 clients in focus, but also may be useful with traces as far back as Windows 7.

Note

This troubleshooter uses examples that demonstrate a general strategy for navigating and interpreting wireless component Event Tracing for Windows (ETW). It is not meant to be representative of every wireless problem scenario.

Wireless ETW is incredibly verbose and calls out a lot of innocuous errors (rather flagged behaviors that have little or nothing to do with the problem scenario). Simply searching for or filtering on 'err', 'error', and 'fail' will seldom lead you to the root cause of a problematic Wi-Fi scenario. Instead it will flood the screen with meaningless logs that will obfuscate the context of the actual problem.

It is important to understand the different Wi-Fi components involved, their expected behaviors, and how the problem scenario deviates from those expected behaviors.The intention of this troubleshooter is to show how to find a starting point in the verbosity of wireless_dbg ETW and home in on the responsible components that are causing the connection problem.

Known Issues and fixes

Make sure that you install the latest Windows updates, cumulative updates, and rollup updates. To verify the update status, refer to the appropriate update-history webpage for your system:

Data Collection

Dell Wireless Wlan Card Utility

1. Network Capture with ETW. Enter the following at an elevated command prompt:

2. Reproduce the issue.

   • If there is a failure to establish connection, try to manually connect.
   • If it is intermittent but easily reproducible, try to manually connect until it fails. Record the time of each connection attempt, and whether it was a success or failure.
   • If the issue is intermittent but rare, netsh trace stop command needs to be triggered automatically (or at least alerted to admin quickly) to ensure trace doesn’t overwrite the repro data.
   • If intermittent connection drops trigger stop command on a script (ping or test network constantly until fail, then netsh trace stop).

3. Stop the trace by entering the following command:

4. To convert the output file to text format:

See the example ETW capture at the bottom of this article for an example of the command output. After running these commands, you will have three files: wireless.cab, wireless.etl, and wireless.txt.

Troubleshooting

The following is a high-level view of the main wifi components in Windows.

The wifi connection state machine has the following states:

• Reset
• Ihv_Configuring
• Configuring
• Associating
• Authenticating
• Roaming
• Wait_For_Disconnected
• Disconnected

Standard wifi connections tend to transition between states such as:

Connecting

Reset --> Ihv_Configuring --> Configuring --> Associating --> Authenticating --> Connected

Disconnecting

Connected --> Roaming --> Wait_For_Disconnected --> Disconnected --> Reset

Filtering the ETW trace with the TextAnalysisTool (TAT) is an easy first step to determine where a failed connection setup is breaking down. A useful wifi filter file is included at the bottom of this article.

Use the FSM transition trace filter to see the connection state machine. You can see an example of this filter applied in the TAT at the bottom of this page.

The following is an example of a good connection setup:

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The following is an example of a failed connection setup:

By identifying the state at which the connection fails, one can focus more specifically in the trace on logs just prior to the last known good state.

Examining [Microsoft-Windows-WLAN-AutoConfig] logs just prior to the bad state change should show evidence of error. Often, however, the error is propagated up through other wireless components.In many cases the next component of interest will be the MSM, which lies just below Wlansvc.

Drivers upek. The important components of the MSM include:

• Security Manager (SecMgr) - handles all pre and post-connection security operations.

• Authentication Engine (AuthMgr) – Manages 802.1x auth requests

Each of these components has their own individual state machines which follow specific transitions.Enable the FSM transition, SecMgr Transition, and AuthMgr Transition filters in TextAnalysisTool for more detail.

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Continuing with the example above, the combined filters look like this:

Note

In the next to last line the SecMgr transition is suddenly deactivating:
[2] 0C34.2FF0::08/28/17-13:24:29.7512788 [Microsoft-Windows-WLAN-AutoConfig]Port[13] Peer 8A:15:14:B6:25:10 SecMgr Transition DEACTIVATE (11) --> INACTIVE (1)
This transition is what eventually propagates to the main connection state machine and causes the Authenticating phase to devolve to Roaming state. As before, it makes sense to focus on tracing just prior to this SecMgr behavior to determine the reason for the deactivation.

Enabling the Microsoft-Windows-WLAN-AutoConfig filter will show more detail leading to the DEACTIVATE transition:

The trail backwards reveals a Port Down notification:

[0] 0EF8.1174:: 08/28/17-13:24:29.705 [Microsoft-Windows-WLAN-AutoConfig]Received IHV PORT DOWN, peer 0x186472F64FD2

Port events indicate changes closer to the wireless hardware. The trail can be followed by continuing to see the origin of this indication.

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Below, the MSM is the native wifi stack. These are Windows native wifi drivers which talk to the wifi miniport drivers. It is responsible for converting Wi-Fi (802.11) packets to 802.3 (Ethernet) so that TCPIP and other protocols and can use it.

Enable trace filter for [Microsoft-Windows-NWifi]:

In the trace above, we see the line:

This is followed by PHY_STATE_CHANGE and PORT_DOWN events due to a disassociate coming from the Access Point (AP), as an indication to deny the connection. This could be due to invalid credentials, connection parameters, loss of signal/roaming, and various other reasons for aborting a connection. The action here would be to examine the reason for the disassociate sent from the indicated AP MAC (8A:15:14:B6:25:10). This would be done by examining internal logging/tracing from the AP.

Resources

802.11 Wireless Tools and Settings
Understanding 802.1X authentication for wireless networks

Example ETW capture

Wifi filter file

Copy and paste all the lines below and save them into a text file named 'wifi.tat.' Load the filter file into the TextAnalysisTool by clicking File > Load Filters.

Dell Wireless Wlan Card Driver

TextAnalysisTool example

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In the following example, the View settings are configured to Show Only Filtered Lines.