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2025-10-15T10:06:37.1166667+00:00

Recently my local hosted IIS services is not running after the new update. My visual studio projects also can't be run as well. I have to delete the new update in order to run my projects and local hosted services again. May I know what is the problem?

Developer technologies | ASP.NET | Other

  1. 2025-10-16T01:35:30.3+00:00

    Kestrel version seems working fine. As temporary solution I planned to run this on localhost

  2. 2025-10-16T03:10:25.1933333+00:00

    I did restore the register, and it was worse. I have not yet recover from the problems it produces.

  3. 2025-10-16T05:03:02.5+00:00

    I have the same issue. Kept getting error "ERR_HTTP2_PROTOCOL_ERROR" while trying to access an app deployed in IIS.

    Spent 6+ hours trying any other possible fix:

    • Removing the enforcement on TLS1.3 - Did not work.
    • Restoring administration.config file to various previous versions - Did not work
    • Towards the 6 hours GPT gave me some error messag that was starting to match my results:
      • use curl to test connection, for example: "curl -vk --resolve your.certificate.url:12345:127.0.0.1 https://your.certificate.url:12345/"
      • then use this command line to isolate the problem:
        • Get-ChildItem "C:\Windows\System32\LogFiles\HTTPERR" | Sort LastWriteTime -Desc | Select -First 1 | % { Get-Content $_.FullName -Tail 100 } 
                Look for a line containing port
      • My result was "Connection_Dropped"
    • Then GPT's suggestion was to create a brand new "sterile" site to compare results against my site.
      • The steps for this felt pretty intense, so I start to take the root of uninstalling updates.
    • Uninstalled KB5066835, KB5066131, KB068331 via command line (1 of them gave an error "update not installed")
    • Uninstalled KB5064401 and KB5065789 via the uninstall button in windows settings - Updates history
    • Every time with a restart and tests in between.
    • After removing KB5065789 and restarting, the app started working properly again.
    • So the problem is either on KB5065789 or multiple of these 5 updates

    Hope this helps someone

  4. 2025-10-16T06:08:03.6933333+00:00

    Great job, it's like pushing it directly to master, resolved by a system update without any update notice.

  5. 2025-10-16T09:06:15.29+00:00

    Microsoft seems to have reacted very quickly and posted a new update file online.

    I uninstalled KB5066835 on all affected computers at 1 a.m. today – which solved the problem.

    I forgot to pause updates for the next few days on one computer. The computer reinstalled the update there. But that worked.

    This morning, I reinstalled the update on all other computers, and everything is working perfectly again.

    For once, Microsoft reacted very quickly here. I suspect because millions of customers were affected (IIS + HTTP listener).

  6. 2025-10-16T10:30:42.2633333+00:00

    Thank you so much, I wasted a whole day yesterday because of this shocker. None of the websites on my machine worked after a reboot and I just couldn't figure it out, uninstalling IIS, changing firewall settings, stopping AV etc. This morning I have uninstalled KB5065789 and I am back in business. Completely outrageous outage - Thanks Microsoft for yet another complete shambles.

  7. 2025-10-16T15:22:37.76+00:00

    I fixed this without removing updates KB5066835 cumulative win 11 and KB5066131 .net 3.5 and 4.8.1 by uninstalling and reinstalling IIS, .Net 3.5, and the ASP.Net developer runtime features from windows on the local intranet app server. This allowed the windows updates to stay in place.

  8. 2025-10-16T18:52:55.8566667+00:00

    Hi Microsoft you need to add a new patch to fix all of this, after I removed the patch, all my solutions were working and my IIS now is working properly, is the only solution I saw it and applied to my computer

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  1. 2025-10-16T05:23:40.57+00:00

    Hi there!

    This morning there was a Defender update, I have installed it an now it works!!!

    1. 2025-10-16T07:57:52.7733333+00:00

      For my part I didn’t see the update either.... I rebooted the PC but didn’t see it, and it wasn’t installed. Maybe the update is being rolled out later in some countries? My solution: I uninstalled update KB5066835 and now everything works again. I’ve paused Windows Update for 5 weeks and will check later if there’s an update that fixes this issue.

    2. 2025-10-16T08:08:45.95+00:00

      I have installed the "Security Intelligence Update for Microsoft Defender Antivirus - KB2267602 (Version 1.439.210.0)" today and for me it is now working again!

    3. 2025-10-16T08:14:37.7166667+00:00

      Installed the update and now working!

    4. 2025-10-16T08:27:44.0866667+00:00

      No need to roll back or disable updates

      Repair the WCF Services installation by re-enabling all associated features. This process forces the system to properly reconfigure the affected components without requiring a full rollback of the Windows update.

      1. Open the Control Panel. You can do this by searching for "Control Panel" in the Start Menu.
      2. Navigate to Programs > Programs and Features.
      3. Click on Turn Windows features on or off in the left-hand menu.
      4. In the list of features, scroll down and expand .NET Framework 4.8 Advanced Services.
      5. Expand WCF Services.
      6. Select all of the WCF Services by clicking the checkbox next to the parent "WCF Services" folder. If any are already checked, uncheck and then re-check them to ensure they are re-enabled.
      7. Click OK to apply the changes.
      8. You may be prompted to restart your computer. It is critical to do this restart for the changes to take effect and for the services to be properly re-registered.

    5. JohnR 0 Reputation points

      2025-10-16T09:09:01.79+00:00

      Just tested that. I acknowledge that the Defender update resolved the issue

    6. 2025-10-16T09:19:02.57+00:00

      Worked for me as well (wasn't able to remove updates before so this works without updating). For the ones who couldn't update online can download and install it from (I did like that):
      https://www.microsoft.com/en-us/wdsi/defenderupdates

      Just keep in mind, the file you downloaded seems like doing nothing. Just run it with admin privilages and wait couple of minutes and restart your pc. It should work.

    7. 2025-10-16T10:18:43.34+00:00

      To force Windows Defender updates, as per https://www.microsoft.com/en-us/wdsi/defenderupdates

      From an Administrator CMD run the following to update definitions. You must reboot after for the fix to take effect:

      cd %ProgramFiles%\Windows Defender
MpCmdRun.exe -removedefinitions -dynamicsignatures
MpCmdRun.exe -SignatureUpdate

    8. 2025-10-16T12:38:22.36+00:00

      Don't uninstall anything at this point and turn back on windows updates. Originally uninstalling KB5066835 and KB5065789 resolved this - but we had dozens of machines unable to uninstall KB5065789 due to an error. Reinstalling KB5066835 later in the day on the machines with failed KB5065789 resolved the issue for us on ALL machines.

      This is all dumb - and cost so many people wasted time...

    9. 2025-10-16T13:41:35.79+00:00

      I can confirm that this indeed corrects the problem. My use of HTTP.sys now functions normally with all windows/defender updates applied.

    10. 2025-10-16T14:15:13.6733333+00:00

      Yeah! working now, in my case, using Windows 11, went to:

      • Windows Security, Virus & threat protection, Virus & threat protection settings, updated to latest (last update 10/16/2025).
      • Back to settings, Windows Update, re-enable Get latest updates, updated, restarted.

      Now IISExpress working and able to run localhost, thanks!

    11. 2025-10-16T14:31:51.5266667+00:00

      Installing this Microsoft Defender Antivirus update - KB2267602 solved my problem

    12. 2025-10-16T15:35:05.9333333+00:00

      In my case, I uninstalled IIS Express from Windows applications. I restarted my computer. And I downloaded and installed the latest version from Microsoft's page. It worked perfectly.

    13. 2025-10-16T17:21:47.2333333+00:00

      We're seeing that many machines automatically got the defender update, and we just need to reboot them, after which all is working again.

    14. 2025-10-16T20:44:38.1366667+00:00

      Some of our devs were having this issue yesterday along with other staff using applications that relied on the .net httplistener. Not all staff with the KB5066835 update ran into those issues though. Just some staff oddly enough. So we paused pushing the updates to anyone else.

      Then this morning all the staff who had issues reported in that their apps started working again after a reboot. We made no changes on our end so were very confused.

      Then I saw this answer about updating Defender and that could explain what we were seeing. If a combination of the KB5066835 and a specific Windows Defender update was the cause of the issue or if Microsoft placed a patch in a Defender update this morning. Then that could be the resolution for some users.

      I suggest making sure you are on the latest Defender update and rebooting as one of your first trouble shooting steps before attempting to remove updates.

    15. 2025-10-23T23:15:32.8966667+00:00

      Did this break again today? System installed Security Intelligence update for MS Defender KB2267602 and now the problem has resurfaced for me.

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50 additional answers

  1. 2025-10-15T12:30:02.88+00:00

    Same problem here.

    Had to uninstall KB5066835 AND KB5065789 on hundreds of computers this morning...

    Please fix this issue

  2. 2025-10-15T10:20:57.7233333+00:00

    Hi Sashi Kumar ,

    Thanks for reporting this.

    The behavior you're experiencing with IIS (Internet Information Services) and its impact on Visual Studio projects may be related to recent system changes. Here's a temporary workaround that has helped others restore IIS Manager functionality:

    • Uninstall KB5066835 and KB5065789 These updates may interfere with IIS-related services. Removing them has resolved the issue in several cases.
    • Restore the administration.config file Try locating subfolders (e.g., CFGHISTORY_000000001x) under the C:\inetpub\history directory. These folders often contain earlier versions of the administration.config file. Copy one of these files to the C:\Windows\System32\inetsrv\config directory to help restore IIS Manager successfully.

    Hope this helps!

    1. 2025-10-15T22:43:36.8+00:00

      I uninstalled KB506683 and 5066835. that fixed the problem. And saved me from heart attack...

    2. 2025-10-16T02:07:29.85+00:00

      Thanks!!! I hope this works! Have not been able to debug vs projects all day!

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  3. 2025-10-15T12:21:53.5266667+00:00

    Same problem here. Had to uninstall KB5066835 AND KB5065789 on 500 computers this morning...

  4. 2025-10-15T12:05:48.1133333+00:00

    same issue, resolved after uninstall it along with KB5065789

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