Author Topic: Web Shield issue since recent update  (Read 420 times)

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Offline sjoram

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Web Shield issue since recent update
« on: October 27, 2021, 08:37:21 PM »
Since a recent update (issue has only appeared in recent days, last application update 21/10, I'm getting various HTTP errors, but only intermittently on certain sites.

Initially this appeared to only be affecting Chrome but spread today to Edge.

Since the issue appeared in Edge, I deduced that it couldn't be the browser. Through a process of elimination, I got to the point of disabling the Web Shield in Avast. At this point, the errors instantly disappeared for sites I'd otherwise been unable to access.

The error I have seen today was ERR_HTTP2_FRAME_SIZE_ERROR however in recent days I've seen a slightly different HTTP2 error (I don't have a note & can't recall exactly what it was).

Has anyone else seen this/is it a known issue?

As soon as I re-enable the Web Shield, I start to see the issues again.

Offline DavidR

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Re: Web Shield issue since recent update
« Reply #1 on: October 27, 2021, 09:12:16 PM »
Not seen this on my system. 
A new version of avast has just been released 21.9 - https://forum.avast.com/index.php?topic=306968.0 - it might be worth trying that first.

It is strange not to get an Avast Alert rather than an error from the browser ?
https://www.google.co.uk/search?q=ERR_HTTP2_FRAME_SIZE_ERROR+chrome+edge

Is this on all sites or just some ?
If some which ones ?

Some sites may be using old http connections or may not support certain features.
Avast UI > Settings > Protection > Core Shields - Web Shield try unchecking the Enable QUIC/HTTP3 scanning (enable the Web Shield) and see if that makes any difference.
Windows 10 Home 64bit/ Acer Aspire F15/ Intel Core i5 7200U 2.5GHz, 8GB DDR4 memory, 256GB SSD, 1TB HDD/ avast! free 21.9.2494 (build 21.9.6698.703) UI 1.0.672/ Firefox, uBlock Origin, uMatrix/ MailWasher Pro/ Avast! Mobile Security

Offline sjoram

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Re: Web Shield issue since recent update
« Reply #2 on: October 27, 2021, 09:36:13 PM »
Saw the issue intermittently last few days on forums.flyer.co.uk / just-eat.co.uk

These seemed to be an issue in Chrome (including incognito), but OK in Edge.

My work email moved from on-prem to Exchange Online last night and MS 365 webmail consistently wouldn't load in Chrome or Edge tonight, unless I disabled Web Shield. Once I got to my Inbox, I could re-enable and carry on working.

Checked Avast for application and definition updates, both are running the latest.

Offline DavidR

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Re: Web Shield issue since recent update
« Reply #3 on: October 28, 2021, 12:24:09 AM »
No problem connecting to either of those sites, but my default and only browser on this win10 system is Firefox.

I culled Edge completely in win10 and don't/won't use Chrome, so I don't know if it is only effecting those browsers.  But incognito mode can break some sites. 

Did you try unchecking the option I gave you ?
Windows 10 Home 64bit/ Acer Aspire F15/ Intel Core i5 7200U 2.5GHz, 8GB DDR4 memory, 256GB SSD, 1TB HDD/ avast! free 21.9.2494 (build 21.9.6698.703) UI 1.0.672/ Firefox, uBlock Origin, uMatrix/ MailWasher Pro/ Avast! Mobile Security

Offline sjoram

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Re: Web Shield issue since recent update
« Reply #4 on: October 28, 2021, 12:41:03 AM »
Missed that on your last, will check & monitor.