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MtnMike
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Posts: 12
Registered: ‎12-23-2014
Location: US
Views: 289
Message 1 of 3

X1T3: Windows Update KB4476976 Kills Network Connectivity

ThinkPad X1 Tablet 3rd Gen

Windows 10 1809 (17763.253)

 

After applying the Windows 10 Update KB4476976 and rebooting, I can connect to a wireless access point, but get the "yellow triangle" warning and a statement of "Connected - No Internet Access."  This is both wireless connections and wired connections made via a Lenovo USB-C dock.  I get an IP address assignment, but I can't even ping the gateway.

 

Uninstalling the update immediately and perfectly restores all network connectivity.

 

I've tried to install the update a few more times, and every time the update kills network connectivity completely; uninstall the update and all network functionality is restored.

 

Anyone experiencing this?  Anyone have any ideas on how to fix it?!  (I'm thinking it's a Windows problem, not a Lenovo/Intel HW problem...)  I'm a pretty good Windows troubleshooter, but I'm stumped.

 

Thanks.

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Lenovo Staff
Lenovo Staff
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Registered: ‎10-29-2009
Location: NC
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Message 2 of 3

Re: X1T3: Windows Update KB4476976 Kills Network Connectivity

I applied this KB to my X1T3 but I am not having any network problems.  When I have seen this kind of problem in the past, it was an incompatibility with other software on the system.  So try uninstalling your AV/security/firewall software as an experiment.  Are there any clues in Event Viewer?

MtnMike
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Posts: 12
Registered: ‎12-23-2014
Location: US
Views: 116
Message 3 of 3

Re: X1T3: Windows Update KB4476976 Kills Network Connectivity

SomeOtherGuy,

 

Thanks for the tip.  I'm not using any third-party AV or firewall software, only what is included with Windows.  But I can disable that and see if anything changes.  I'm pretty sure it has something to do with the Windows 10 load on my particular machine, or, as you said, some other application I have installed.  I have a Macrium image of my machine when it was fresh out of the box.  I may lay down that image and see if I can upgrade it with KB4476976 without losing networking.  I'll report back...

 

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