Hello,
We have identified the issue as a problem during program update, that left some old Avast stuff there, that should have been updated.
To fix the problem please perform a repair: https://support.avast.com/en-eu/article/Repair-Antivirus
Or uninstall and newly re-install your Avast Antivirus.
Permanent fix for the update issue is coming in future version.
Thank you,
Filip
some french users with this issue seem to say repair doesn’t work :-\ stream filter stays with v.17.8.3705.0
Or uninstall and newly re-install your Avast Antivirus.
this seems to be the solution waiting the next update 
Repair Avast:
Control Panel> Program and Features (Add/remove program)>Select Avast> Select Repair. Reboot when completed
https://www.avast.com/faq.php?article=AVKB204
If Repair doesn’t fix the problem, try the following:
Clean Install of Avast:
https://goo.gl/4Ptzkf
If you need additional help with the Clean Install, watch this:
https://youtu.be/p-h3myRD51A
users do not need this kind of help that has already been given above
A repair doesn’t work !!!
there is no need for a clean installation, a simple re-installation works (according to users), as already proposed by Filip Braun.
Of course the clean installation procedure is generally proposed in the French forum in a post-it topic called “toolbox” that I created to help French users (and yes, I spend time helping myself) ,procedure to use only as a last resort, and not at the slightest opportunity.
My intervention was a simple report and not a request for additional help, French users were able to solve their problem with Filip Braun’s advice (which I translated) , thanks.
I posted this issue on MWB’s forum and then came here. I had this problem after updating Avast on thursday. Currently I have Avast set to not load at startup, so its not on and I have MWB 3’s web protection set to off to prevent internet blocking and other window related issues such as the inability to access network diagnosis and event viewer. Another problem I had restarting my PC to finish the update, it hangs, and I have to hit the reset button.
I looked for both files mentioned in this thread and found that along with the updated version the old one is still present.
I have same prob. (with Internet Security, Paid Ver)
No internet access. Affects almost all software which access the internet.
WorkAround= Disable BOTH WEB and REALSite components.
The REPAIR* did not help
(*“To fix the problem please perform a repair: https://support.avast.com/en-eu/article/Repair-Antivirus
Or uninstall and newly re-install your Avast Antivirus.” Filip AVAST)
Reluctant to do complete re-install … because of the work, risks and time-expense involved.
Any easier ideas.?
Stewart.
As said before , a repair doesn’t work for this issue.
So you haven’t choise to wait for new version or re-install it.
obviously no need to do a clean install so work and time-expense ??? 5 minutes ? less than the time for you to post
risk ? aren’t you paranoid
My Dell Inspiron 6400 continues to stall after initialing the opening of one program. I think version 18.6.2349 is causing damage beyond Google Chrome.
My pc Doc found that the VPN was blocking me getting onto the web !
Several days have passed since the last substantive replies for this problem. I have put in all Avast/M’bytes exclusions. I have uninstalled (clean uninstall) and reinstalled Avast. These did not work. I contacted Avast tech support and was strongly urged to spend money for “advanced diagnostics” (shame!). Are Avast programmers/developers working on this?
Have you tried to totally remove Malwarebytes to see if that clears the problem ???
This would include downloading and running MB-Clean. You can download that tool from
https://forums.malwarebytes.com/topic/196955-malwarebytes-support-tools/
SUCCESS
I did following (using helpful info in earlier posts *)
Downloaded AvastClear.exe and avast_internet_security_setup_offline.exe
Uninstall of Avast Internet Security via Control Panel
Ran AvastClear (went to Safe mode when asked)
Install
Setup
Connected Wifi
Activated ( ie I am using paid version)
Completed setup.
Took a about 60 minutes (mostly: download, reading, checking, documenting, restorePoint and other paranoid behavior )
A BONUS: Behavior shield now can be switched ON (previously I could not get the ON setting to Stay]
Reference the helpful POST by bob3160
“Clean Install of Avast:
https://goo.gl/4Ptzkf
If you need additional help with the Clean Install, watch this:
https://youtu.be/p-h3myRD51A”
Good news. Happy to help.
I was using Avast Free Version, but Avast keeps showing pop-up about upgrade to Premium Avast. I did upgrade, paid the money and then lost the Internet connection. Well done from Avast! Keep user stay away from the Internet is the safest way to protect computer
Is your Firewall set to Private ???
More help here, https://help.avast.com/en/av_free/12/page_fw_settings.html
What do you mean?
What do you mean?Firewall network profile. Puplic or private
https://support.avast.com/en-eu/article/Antivirus-Firewall-Application-Rules
Where to find firewall network profile? Also my wireless adapter is hidden.
Where to find firewall network profile?Have no idea, I don't use avast.
I will copy important data an reinstall windows. Took my money and took my internet. Bye Avast! Don’t have time to fix this shit