Windows 10: Realtek network adapter not working after Microsoft Windows security update KB5031356

THE SAME PROBLEM AGAIN: Realtek PCI GbE Family Controller network adapter not working after Microsoft Windows security update KB5031356.Updating the driver does not help. But after uninstalling this Microsoft Windows security update KB5031356 - the network adapter works fine again.

:)

 

How to Dump Networking Parameters?


Had a customer with this problem, they had a brand new Dell Optiplex 3050, with Windows 10 1709, and Realtek Gbit Family of lan adapters (wired connection). After much troubleshooting (many suggestions listed in the course of this thread), it turned out the PC needed a bios update. Among the updates listed on the dell website for bios version 1.52 (I flashed it with the latest 1.92) was "Update RealtekLOM".

LOM is "lan on motherboard" and the Realtek has flashable firmware.

One step for others having this issue is to check their computer manufacturer's website for "Lom" firmware updates for the particular network adapter - whether integrated or an add-in.

 

network adapters

Hi, Michael.



Thank you for posting your query in Microsoft Community.

As per my understanding, you may be facing an issue with your driver updates.

I suggest that you perform the steps mentioned below and check if it helps you resolve your issue.



Method 1: Network troubleshooting

• • • On the search bar type “Troubleshooting”
    • Click on “Network and Internet”
    • Click on “Network Adapter” and run the troubleshooter.

Method 2: Download and install the latest firmware updates for the Network adapter

Follow these steps to un-install the drivers:

• On the search bar type “ Device Manager”
• On the left pane locate “Network Adapter” and expand by clicking on it
• Right on the “ Network driver” option and click “Uninstall’
• Download the latest Wireless network adapter driver setup file from the manufacturer’s website and install it.

Your reply is very important for us to ensure a proper resolution. Please get back to us with the above information in order to assist you accordingly.

For further assistance, you can post your query in Microsoft Community

 

Realtek wifi adapter isn't working

This problem started a few days ago. Initially I thought it was due to a dead spot in our home. After a few days I realized that was not the case. The troubleshooter narrowed it down to the Realtek wifi adapter. I went to
the Network adapters under Device Manager. There was an indicator there (the yellow triangle I think). I checked for driver update, there were none. Received a "message" that I had the driver recommended and/or up to date. I found info suggesting I roll back
the driver. That option is not available. I found suggestion to uninstall the network adapter, restart and hopefully that reinstalls the driver. That didn't work. The Realtek adapter that I initially was dealing with is now gone. I had other messages in Device
Manager saying the adapter couldn't start code 10 and couldn't be found. I currently have Realtek PCle FE Family Controller listed. I think that was there before but not the wifi adapter initially identified as this problem. This controller seems to be ok.
I found information suggesting some type of installation or update could be the culpret. I had recently upgraded a program so did a system restore back to before the update. Initially this seemed to work but now the problem is back. I found information about
generating a wlanreport but received "failed, error is 0x3A98." I found this Fix Wi-Fi connection issues in Windows - Microsoft Support. I don't believe the problem is the router, modem, etc. basic issues. Ethernet cable works
but that was never the issue. I did not turn off firewall, antivirus protection, etc. as that seems irrelevant and I'm hesitant to do anything anymore. This only other thing on this list that I haven't done is the network reset. Again, hesitant to try anything
else, especially when this article says "last resort." It appears to me that I have completely lost the ability to use wifi and that the realtek adapter needs to be turned back on or reinstalled and nothing else I've seen seems to offer that solution. I tried
virtual assistant which led to some of the suggestions. I thought there was a chat available, can't find it. I don't see what the Skype option is supposed to do; it doesn't seem to "call" anyone.

Trying to find more Realtek info in history: Realtek RTL8821ae wireless lan 802.11ac may be the actual adapter that no longer shows up.