> ## Content Index > Fetch the complete content index at: https://nolongerset.com/llms.txt > Use this file to discover other available public pages before exploring further. # BUG ALERT: FortiClient VPN and Windows Update KB5018410 - URL: https://nolongerset.com/bug-alert-forticlient-vpn-kb5018410/ - Published: 2022-10-14T03:28:13.000Z - Updated: 2026-05-08T12:54:15.000Z - Description: A recent Windows Update broke my FortiClient VPN. Learn which update was responsible, how to uninstall it, *and* how to keep it from coming back. - Author: Mike Wolfe - Tags: Bug Alert, #Import 2026-05-20 02:59 Patch Tuesday strikes again! I got the following warning message when trying to connect to one of my clients via the FortiClient VPN: > **Warning** > The server you want to connect to requests identification, please choose a certificate and try again. (-5) ![](https://storage.ghost.io/c/eb/d7/ebd732c1-5f03-4f07-b386-5d08557e15c9/content/images/2022/10/image-19.png) ## Checking FortiClient VPN for Updates Before uninstalling Windows security updates, I checked to make sure I had the latest version of the FortiClient VPN client utility. ![](https://storage.ghost.io/c/eb/d7/ebd732c1-5f03-4f07-b386-5d08557e15c9/content/images/2022/10/image-21.png) Version 5.6.6.1167 of FortiClient VPN It said "latest version", but for all I know it's been saying that for months. It doesn't even say when it performed its last update check. So, I went to the [FortiClient VPN download page](https://www.fortinet.com/support/product-downloads#vpn) and downloaded their automatic updater. I ran the Online Updater utility, but all it did was confirm that, yes, I did have the latest version of FortiClient VPN: ![](https://storage.ghost.io/c/eb/d7/ebd732c1-5f03-4f07-b386-5d08557e15c9/content/images/2022/10/image-22.png) Satisfied there was nothing more I could do with my VPN client utility, I moved on to the next troubleshooting step. ## Confirm No Changes Made to the VPN Server I reached out to our client to see if they had made any recent changes to their VPN server. They had not. I then checked with a colleague to see if he could connect to their VPN. He was still able to. At least until his FortiClient VPN required a reboot (probably because it detected a pending Windows Update)...at which point Windows installed updates...and following said reboot...he was also unable to connect. This was all the confirmation I needed that the Windows Update was the source of this newfound error. ## Uninstalling the Update I checked my recent updates and found what turned out to be the culprit: **[KB5018410](https://support.microsoft.com/en-us/topic/october-11-2022-kb5018410-os-builds-19042-2130-19043-2130-and-19044-2130-6390f057-28ca-43d3-92ce-f4b79a8378fd)**. To uninstall the update, I went to **Control Panel > Programs > Programs and Features > Installed Updates** ![](https://storage.ghost.io/c/eb/d7/ebd732c1-5f03-4f07-b386-5d08557e15c9/content/images/2022/10/image-23.png) ![](https://storage.ghost.io/c/eb/d7/ebd732c1-5f03-4f07-b386-5d08557e15c9/content/images/2022/10/image-24.png) ![](https://storage.ghost.io/c/eb/d7/ebd732c1-5f03-4f07-b386-5d08557e15c9/content/images/2022/10/image-25.png) Following the restart, I was able to successfully connect once again: ![](https://storage.ghost.io/c/eb/d7/ebd732c1-5f03-4f07-b386-5d08557e15c9/content/images/2022/10/image-37.png) ## Deja Vu All Over Again When I came in the next morning, my computer had rebooted again overnight. KB5018410 was back! And, once again, it broke my FortiClient VPN. I uninstalled the Windows Update (again), rebooted my computer (again), and then confirmed that FortiClient VPN was working (again). ## Blocking the Windows Update from Reinstalling This was not a sustainable situation, so I set about preventing the KB5018410 update from installing again. I followed the instructions here: [How to Hide or Show Windows Updates in Windows 10](https://www.tenforums.com/tutorials/8280-hide-show-windows-updates-windows-10-a.html). The link above includes a downloadable copy of the Windows Update Show/Hide utility from Microsoft. The utility is apparently no longer available from its original home at Microsoft. To ensure it remains available on the web *somewhere* into the future, I'll also make it available here: - [**Windows Update Show/Hide Utility**](https://assets.nolongerset.com/2022/wushowhide.zip) Shown below are screenshots that capture the steps I followed to prevent the update from being reinstalled: ![](https://storage.ghost.io/c/eb/d7/ebd732c1-5f03-4f07-b386-5d08557e15c9/content/images/2022/10/image-26.png) ![](https://storage.ghost.io/c/eb/d7/ebd732c1-5f03-4f07-b386-5d08557e15c9/content/images/2022/10/image-27.png) ![](https://storage.ghost.io/c/eb/d7/ebd732c1-5f03-4f07-b386-5d08557e15c9/content/images/2022/10/image-28.png) ![](https://storage.ghost.io/c/eb/d7/ebd732c1-5f03-4f07-b386-5d08557e15c9/content/images/2022/10/image-29.png) ![](https://storage.ghost.io/c/eb/d7/ebd732c1-5f03-4f07-b386-5d08557e15c9/content/images/2022/10/image-30.png) ![](https://storage.ghost.io/c/eb/d7/ebd732c1-5f03-4f07-b386-5d08557e15c9/content/images/2022/10/image-31.png) ![](https://storage.ghost.io/c/eb/d7/ebd732c1-5f03-4f07-b386-5d08557e15c9/content/images/2022/10/image-32.png) ![](https://storage.ghost.io/c/eb/d7/ebd732c1-5f03-4f07-b386-5d08557e15c9/content/images/2022/10/image-33.png) ![](https://storage.ghost.io/c/eb/d7/ebd732c1-5f03-4f07-b386-5d08557e15c9/content/images/2022/10/image-34.png) ![](https://storage.ghost.io/c/eb/d7/ebd732c1-5f03-4f07-b386-5d08557e15c9/content/images/2022/10/image-35.png) ## My Environment I have no idea how widespread this problem is. Please let me know in the comments below if this affected you. I am running **Windows 10** (64-bit) version **21H1** (Build 19043.2130): ![](https://storage.ghost.io/c/eb/d7/ebd732c1-5f03-4f07-b386-5d08557e15c9/content/images/2022/10/image-38.png)