KB5003637 (and the new KB5004476) gives error "Failed to load resource: net::ERR_HTTP2_PROTOCOL_ERROR" in web browser using Visual Studio 16.10.1. or 16.10.2.

Question

Hi,

After installing the automatic update KB5003637 3 days ago, building web apps using Visual Studio 16.10.1. or even latest update Visual Studio 16.10.2. produces the error "Failed to load resource: net::ERR_HTTP2_PROTOCOL_ERROR" in web browser (Images, css, etc don't load properly anymore).

It is clear in my case uninstalling the KB5003637 solves the issue. The only problem is when wanting to update Windows 10 it installs that same update over and over again.
The option to exclude/hide the update isn't there anymore, so this is very annoying.

I'm not the only one experiencing this problem as you can find here: https://stackoverflow.com/questions/67911570/failed-to-load-resource-neterr-http2-protocol-error-for-react-app-after-upg/67934980?noredirect=1#comment120151946_67934980.

Also the new update KB5004476 (which replaced the previous update KB5003637) is causing the same error. When installed I get the exact same errors, uninstalling solves it instantly.

Please advise, something is really wrong with these updates.

UPDATE!
Microsoft finally released a fix that works for me, as you can read here (last post): https://developercommunity.visualstudio.com/t/Failed-to-load-resource:-net::ERR_HTTP2_/1446262?viewtype=all Installing the most recent update KB5004237 solves the problem in my case. No more "Failed to load resource: net::ERR_HTTP2_PROTOCOL_ERROR" errors, no more “System Thread Exception not Handled” error so far too! Yay! :)

Thanks in advance!
Kind regards,
Lester De Meyer.

Answer 1

Hi,

Yesterday after 1 single refresh (F5), when testing my web application, I also had the same blue screen like already mentioned here.
It showed the error "System Thread Exception not Handled" in file "HTTP.sys" and restarted, amazing!

Also 2 new updates where installed KB5003690 and KB5003537 today, but nothing changed, I still have the annoying errors.
Previous updates KB5003637 and KB5004476, where it started to go wrong, are gone here.

The workarounds mentioned so far are only good for local developing or just don't work.

The question has been asked here also:
https://developercommunity.visualstudio.com/t/Failed-to-load-resource:-net::ERR_HTTP2_/1446262?viewtype=all

But so far not much response. :(

Kind regards,
Lester.

Answer 2

We have the same issue across 4 devs. Please fix this as soon as possible as it holds us up patching windows and developing. Also we do not see the KB5003637 in order to install nor do we see KB5004476. The only one close seems to be KB5003537 or KB5003690.

Answer 3

Hello.

I have blue screen "HTTP.sys" when I'm using IIS.

Blue screen appear in last days with latest Windows 10 updates.

No other changes has been made.

I hope removing "KB5003637" will solve the problem.

Thank you.

Answer 4

I currently have the same issue and error message on the BSOD.

KB5003637 is not installed on my machine.

Answer 5

Now that KB5004237 has fixed the issue, can users just delete the two registry entries (EnableHttp2Tls, EnableHttp2Cleartext) from
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\HTTP\Parameters
?