Avast WEBforum

Consumer Products => Avast Free Antivirus / Premium Security (legacy Pro Antivirus, Internet Security, Premier) => Topic started by: Lisandro on October 16, 2016, 07:53:50 PM

Title: [Bug] Avast is changing/corrupting downloads
Post by: Lisandro on October 16, 2016, 07:53:50 PM
Well, it's hard to say, but I lost quite some hours to figure out that the culprit is Avast.
1. I've tested Firefox, Chrome, Opera and Edge.
2. I've tried with and without any download manager.
3. I've tried disabling Windows SmartScreen filter.
4. I've tested three different networks (one ethernet and two WiFi).

Only disabling Avast will allow me to download executables, .msi and archive files that match the hash in the download site.
I'm on Windows Insider Preview 14942 (x64).

Title: Re: Avast is changing/corrupting downloads
Post by: bob3160 on October 16, 2016, 08:40:17 PM
No problems on build 14936. There are many reported problems on the version you are using when using an AV other than Defender.

Title: Re: Avast is changing/corrupting downloads
Post by: rush_deleted on October 16, 2016, 08:40:59 PM
i wrote about it here as well, with firefox...
Title: Re: Avast is changing/corrupting downloads
Post by: Lisandro on October 17, 2016, 02:18:39 PM
Bug is still around. Tested today with Notepad++. Download with Avast on gives and error (file corruption).
Disabling Avast and everything goes fine.
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: libor_b on October 17, 2016, 04:37:35 PM
Hello,

This issue is known and we are working on a fix. Currently the way to download files uncorrupted is to turn off Web Shield. I'm sorry for Your troubles.

Libor
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: Rednose on October 17, 2016, 04:48:53 PM
Windows 10 Insider Preview builds are only for testing purposes.
So yes, you can/should expect bugs, unstable systems or worse ;)

Greetz, Red.
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: heikwith on October 17, 2016, 05:06:27 PM
Well, it's hard to say, but I lost quite some hours to figure out that the culprit is Avast.
1. I've tested Firefox, Chrome, Opera and Edge.
2. I've tried with and without any download manager.
3. I've tried disabling Windows SmartScreen filter.
4. I've tested three different networks (one ethernet and two WiFi).

Only disabling Avast will allow me to download executables, .msi and archive files that match the hash in the download site.
I'm on Windows Insider Preview 14942 (x64).

Same problems here with 14942.
After install of 14946 most of my problems are gone.
Only problem left (until now) are download problems with Windows update with updates for Windows Defender.
Problem gone after disabling Avast.
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: Lisandro on October 17, 2016, 11:57:52 PM
Hello,

This issue is known and we are working on a fix. Currently the way to download files uncorrupted is to turn off Web Shield. I'm sorry for Your troubles.

Libor
Thanks for acknowledging it. At least, I don't have to invest more time on discover what is wrong :)
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: heikwith on October 21, 2016, 11:19:26 PM
After install of 14951 still download problems.
Problems gone after disabling Avast
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: Lisandro on October 22, 2016, 03:34:23 AM
I have reverted to 14931 (slow cycle of updates) and everything is fine.
Most probably the multiply instances of svhost processes are behind the issue (but this is just a guess).
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: heikwith on October 24, 2016, 01:23:58 PM
Ticket created for this issue:
#563093 Download problems with W10 Insider Preview Build 14951 for PC
https://support.avast.com/support/tickets/563093

Answer from ticket:

I discussed this problem with our developers and they informed me they are currently working on a fix. The fix version of Avast should be released soon.
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: heikwith on October 26, 2016, 09:56:50 AM

Known issues for PC in build 14955
If you have a 3rd party antivirus product installed on your PC – your PC might not be able to complete the update to this build and roll-back to the previous build.
Read more at https://blogs.windows.com/windowsexperience/2016/10/25/announcing-windows-10-insider-preview-build-14955-for-mobile-and-pc/#IVVmeYJlbdkbOO7M.99
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: heikwith on October 26, 2016, 09:26:02 PM
I have upgraded to 14955 and the download problems still persists
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: Eddy on October 26, 2016, 09:30:10 PM
Looking at all the reported problems with Windows 10, I start to wonder what the worse Windows release is/was.

10 or Vista.
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: bob3160 on October 26, 2016, 10:47:42 PM
Looking at all the reported problems with Windows 10, I start to wonder what the worse Windows release is/was.

10 or Vista.
You are looking at problems in Preview Builds.
There aren't any problems in the latest stable release. :)
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: Eddy on October 26, 2016, 10:53:37 PM
Quote
There aren't any problems in the latest stable release
Not? Muhahaha, if I would name them all here this post would be huge !

There is no stable release as all versions released have many bugs.
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: heikwith on November 05, 2016, 11:52:13 PM
After install of 14959 still download problems.
Problems gone after disabling Avast
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: bob3160 on November 06, 2016, 02:35:37 PM
After install of 14959 still download problems.
Problems gone after disabling Avast
Build 14936 was the last build that had no problems with 3rd part AV's.
Microsoft sitll hasn't addressed the problem. That's one way to force you to use their own Defender.  :(
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: heikwith on November 10, 2016, 06:53:33 PM
After install of build 14965 still download problems.
Problems gone after disabling Avast
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: Lisandro on November 10, 2016, 10:11:45 PM
After install of build 14965 still download problems.
Problems gone after disabling Avast
Thanks for reporting. We need to wait...
The bad is that MS seems not even list the problem in the known problems.
http://www.askvg.com/new-update-build-of-windows-10-technical-preview-now-available-for-download/
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: fartman_survivor on November 11, 2016, 11:34:57 AM
Same issue with the last build 14965 (Released Wednesday)
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: heikwith on November 18, 2016, 07:03:20 PM

After install of build 14971 still download problems.
Problems gone after disabling Avast
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: sewellanne on November 20, 2016, 09:36:28 AM
Hello,

This issue is known and we are working on a fix. Currently the way to download files uncorrupted is to turn off Web Shield. I'm sorry for Your troubles.

Libor

My web shield AND EVERYTHING ELSE is turned off, but despite renewing my subscription in July, your company appears to be trying to force me to pay again! I have contacted support, but in the meantime am uninstalling Avast and downloading a free antivirus program as I need to work!!
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: Asyn on November 20, 2016, 10:14:40 AM
I have contacted support...
Post your ticket-ID.
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: heikwith on November 21, 2016, 10:24:08 AM
I have also an open ticket for download problems:
https://support.avast.com/support/tickets/563093
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: NON on November 21, 2016, 01:01:54 PM
I got a report in the Japanese forum that claims both Web Shield and Secure DNS caused this problem.
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: Lisandro on November 21, 2016, 01:21:04 PM
I got a report in the Japanese forum that claims both Web Shield and Secure DNS caused this problem.
And what is causing the same issue in other antivirus? Avast is not alone here...
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: NON on November 21, 2016, 03:16:35 PM
I got a report in the Japanese forum that claims both Web Shield and Secure DNS caused this problem.
And what is causing the same issue in other antivirus? Avast is not alone here...
Win 10, of course...
But Avast have to fix this before Win10 stable build get released, or there will be a mess. :-\
"Slow" ring beta also has this issue, I doubt Microsoft will do something about this considering the remaining time.
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: bob3160 on November 21, 2016, 03:20:48 PM
I got a report in the Japanese forum that claims both Web Shield and Secure DNS caused this problem.
And what is causing the same issue in other antivirus? Avast is not alone here...
Win 10, of course...
But Avast have to fix this before Win10 stable build get released, or there will be a mess. :-\
"Slow" ring beta also has this issue, I doubt Microsoft will do something about this considering the remaining time.
I'm on build 14936 and set the update sequence to the slow ring. Avast is working quite well. :)
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: NON on November 21, 2016, 04:06:03 PM
I got a report in the Japanese forum that claims both Web Shield and Secure DNS caused this problem.
And what is causing the same issue in other antivirus? Avast is not alone here...
Win 10, of course...
But Avast have to fix this before Win10 stable build get released, or there will be a mess. :-\
"Slow" ring beta also has this issue, I doubt Microsoft will do something about this considering the remaining time.
I'm on build 14936 and set the update sequence to the slow ring. Avast is working quite well. :)
The OP in the Japanese forum reported that he/she had build 14965 on slow ring ???
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: Eddy on November 21, 2016, 04:26:28 PM
Quote
But Avast have to fix this before Win10 stable build get released, or there will be a mess
Microsoft is the one who needs to fix it.
It is (almost) not possible for avast and other av vendors to do something about it as the problem is W10 and Microsoft keep changing things.
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: bob3160 on November 21, 2016, 10:03:40 PM
I got a report in the Japanese forum that claims both Web Shield and Secure DNS caused this problem.
And what is causing the same issue in other antivirus? Avast is not alone here...
Win 10, of course...
But Avast have to fix this before Win10 stable build get released, or there will be a mess. :-\
"Slow" ring beta also has this issue, I doubt Microsoft will do something about this considering the remaining time.
I'm on build 14936 and set the update sequence to the slow ring. Avast is working quite well. :)
The OP in the Japanese forum reported that he/she had build 14965 on slow ring ???
build 14936 was the last build where you could use a third party AV.
Anything after that release required that you only have Defender installed.
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: Lisandro on November 21, 2016, 10:16:16 PM
But Avast have to fix this before Win10 stable build get released, or there will be a mess. :-\
Indeed.

"Slow" ring beta also has this issue, I doubt Microsoft will do something about this considering the remaining time.
I'm on slow ring and did not notice any issue...
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: heikwith on December 08, 2016, 06:29:14 PM
I can hardly believe, but....
After install of build 14986 NO download problems here.
Can one of you confirm that ?
I am running with enabled Final Avast free 2.3.2280 (build 12.3.3154.23) and vps 161208-3 (vps edited)
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: Eddy on December 08, 2016, 07:20:27 PM
You are using a old VPS version.
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: heikwith on December 08, 2016, 08:33:17 PM
You are using a old VPS version.
Sorry, changed
Title: Re: [Bug] Avast is changing/corrupting downloads
Post by: heikwith on December 12, 2016, 11:05:46 PM
https://forum.avast.com/index.php?topic=193975.0