YouTube Struggling After Update

Avast Free Antivirus / Premium Security
41

The problem seems to be related to any Google website.
Youtube, drive.google, translate.google…

I checked the drive.google website with Avast enabled. The website was blank
and I received the network message when inspecting:

https…drive…google…com…m=core

(failed) net:ERR_QUICK_PROTOCOL_ERROR

Disabling Avast does not cause the error.

I looked up this error ERR_QUICK_PROTOCOL_ERROR and it is a protocol used by Chrome.

One solution was to disable it:

chrome://flags/

Search for Quic
Disable

It seems to be working.

1 Like
42

The problem seems to be related to any Google website.
Youtube, drive.google, translate.google…

I checked the drive.google website with Avast enabled. The website was blank
and I received the network message when inspecting:

“Trying to access drive.google” (failed) net:ERR_QUIC_PROTOCOL_ERROR

Disabling Avast does not cause the error.

I looked up this error ERR_QUIC_PROTOCOL_ERROR and it is a protocol used by Chrome.

One solution was to disable it:

chrome://flags/

Search for Quic
Disable

err-quic-protocol-error-1-768x294
err-quic-protocol-error-1-768x294768×294 29.2 KB

It seems to be working.

2 Likes
43

Top detective work there, well done. I’m about to get some sleep but will look further tomorrow.

Thanks again.

44

I found the setting for other browsers (I can’t put links here):

Disable HTTP/3 (QUIC) Protocol in Browsers on User Devices

To disable HTTP/3 protocol on a user device, complete these steps in the relevant browser:

Browser settings can vary for different versions.

Google Chrome

In the browser address bar, type chrome://flags. Disable the Experimental QUIC protocol option.

Microsoft Edge

In the browser address bar, type edge://flags/. Disable the Experimental QUIC protocol option.

Mozilla Firefox

In the browser address bar, type about:config. Disable the network.http.http3.enable option.

Opera

In the browser address bar, type opera://flags/#enable-quic. From the Experimental QUIC protocol drop-down list, select Disabled.

2 Likes
45

Great find! I’m up and running on Chrome with all shields enabled.

Thanks!

46

I would still rather Avast fix their issue than for me having to go into advance Chrome settings in order to fix something that is clearly being caused by Avast’s interaction with the browser.

Staying on 25.2 for the time being, I guess.

1 Like
47

This worked for me, tried it on Firefox.

48

Interesting.

First I can’t recall ever changing anything in that about config setting and most of mine are set to True.

Yet I’m not experiencing any issues.

As this about config entry relates to http connections and not https connections.
I have Firefox only to connect to https secure connections, so I would assume (dangerous I know) that is why I don’t suffer from YouTube issues others are.

b10079
b10079506×289 8.19 KB

49

I have the same issues as well since the last update (25.3.9983a (build 25.3.9983.926)). It is mostly on YouTube, Facebook & Instagram as well as other websites. For the past month it makes websurfing a real pain until I disable Avast which is unwise.

I disabled at least the QUIC/HTTP3 scanning within Avast and it seems to have improved my surfing experience greatly until they fix things within Avast.

Screenshot 2025-04-27 144409
Screenshot 2025-04-27 144409685×709 76.2 KB

2 Likes
50

Avast seemed to have now fixed things with version: 25.4.10068a (build 25.4.10068.0)
Thanks Avast.

2 Likes
51

Isn’t that the latest beta build ?

I say that as I haven’t seen a new release notification in the forum and I have program updates set to Manual.

52

i do not know. I just manually did a program update within Avast and that is what was downloaded. Version 25.4.10068a (build 25.4.10068.0)

2 Likes
53

It could be, Avast has been somewhat slow in posting the New Release information in the Forum.

54

i had a update 25.3 waiting that was dated 9th april but it wasnt there yesterday so i updated even though set to auto update that hasnt worked for years.
now its showing as 25.4 dated 25th april installed.

1 Like
55

Thanks for the clarification. Hopefully Avast will post the New Update details, fixes, etc.

56

So your issue with Youtube (and other sites) being slow and laggy is fixed then? I’m still on version 25.2 so just want to make sure before I update

Can anyone else who had this issue confirm as well?

57

It is mostly fixed now. It is a lot better then before but not perfect. Now & again I still have problems with YouTube videos. Then I disable Avast wait for the video to load & re-enable Avast again.

58

Ah ok, so not really fixed then. Just…kind of improved.

Avast support: get on fixing that permanently, please.

59

I would say it is a 75% improvement. A lot better than it was before.

1 Like
60

Hi,
I have the same problem.