Firewall block all local IP adress: 192.168.1.* After updating

Thank you very much Asyn,

Unfortunately, the only one issue I found is to fully disable the Avast firewall and antivirus.
I’m enough angry, although I understand that sometimes some soft improvements are accompanied by heavy side-effects…
However we as users are waiting on a minimum advertising to keep us positive and confident.

Best Regards,
Ioan

Could you please send your logs to Filip then…!? (Instructions in Reply #11)

Thanks Asyn,

I’ve send that files to Filip

As an addition to my reply #16 above, I am getting a large number of entries in the firewall logs - blocked traffic. It would rarely have an entry before this update, but now I am getting around 1600 entries per hour, or about one every two seconds. Almost all of these just say ‘system’ and 'no rule found. I’ve tried ‘show application’ and then completely opening up the system application, but it keeps getting changed around or back to previous settings (even though it says ‘no rule’) and the log entries continue. This is very unusual, because I would check this, and get entries almost never, less than a page full for months. Example of event list attached. 192.168.1.1 is of course the router, .21 is the TV, my machine is .7, my Synology NAS is .6, and a brother printer is .3 - and there are quite a few other computers and mobile devices on the network as well, perhaps on average a dozen or so at a time.

Is there something I can/should do to try to normalize this?

Would you mind also capturing the firewall logs on the right side, where it says “Rules”? This may give a bit more of a clue on what the Avast Firewall is complaining about.

Thank you!

I have exactly the problem being reported here.
I have two WD NAS units (192.168.0.10 & 92.168.0.12) on my network. I now have to switch off the Shields to get them to work.
My Avast Internet Security is in Private mode, I have done the repair, I am running Windows 10.

This appears to be a common problem.
Not happy as I have wasted two days on this. Maybe time to change.

Same problem. Reply #12 solved it for me. Thanks.

Hi, whilst using https://www.fundingsecure.com (a financial site in the UK) I have found the same thing over the last 2 weeks or so. After 5 or 6 clicks in the site, ‘Connecting…’ and unable to log in again for a couple of hours.

Disabling the firewall whilst ‘Connecting’ allows the site to function again.

For the moment, disabling the port scan (thanks) seems to work- but needs more extensive experience to be sure.

Meanwhile I had rung their IT people- who had no such reports.

Confirmed. Clicking link above gets me to the site but going anywhere else causes a block (time-out). IP is 185.64.90.244

This issue has caused problems for me on 2 different systems…

Laptop connected by ethernet, Kodi streams a video from my NAS for about a minute then hangs.
Works fine on WiFi though?

Desktop PC admin access to router on 192.168.1.1 works for 20 seconds then hangs.

Eventually after seeing this thread I discovered that switching the firewall off cures both these problems.
Examining the firewall rules log shows both problems are being caused by port scan blocking.
Enabling the firewall and disabling the port scans cures both problems.

So there is an issue with port scanning.
What other consequences are there for disabling port scans?

As an aside I also noticed I can’t set the Clear log older than to anything other than 1 week; bug?

After disabling port scanning a couple days ago, the blocking of my NAS and some websites seems to have subsided, though I cannot say it is the right speed etc. without some more testing, which I don’t have time for right now.

The ‘rules’ logs do show that before I turned off port scanning, the NAS was scanning and being blocked (image named withPS), and the other image is the list of the latest rules.

That said, I’m still getting multiple entries per minute numbers of entries in the ‘blocked’ logs, and it shows no rule, and also links to no application most of the time. I have tried editing it to allow ‘all / all’ and then deleting the rule (that the system says is not a rule) but still no change. I changed the setting ‘if there is no rule, then…’ to ‘allow’ instead of ‘auto-decide’ and the log still runs, but the ‘no rule’ entry in the rules column is blank. But the ‘show application’ still goes to nothing in the app manager.

The uncertainty of what is going on and the lack of control is what is getting to me now.

I have been using Avast for about 2 years now and haven’t had any issues connecting to the internet or my router until about 9 PM tonight. I’m glad I came here… “disabling port scanning” :o did the trick. Thank you!

Hi All, same symptoms as everyone else; can’t connect to NAS nor even router IP. Turned off port scan, no luck. Finally did full removal of AIS and reinstall. Then turned off port scan. That seemed to work finally.

Avast needs to fix this. I’ve got 6 licenses and been a customer for over 3 years. Now I’ve got to uninstall/reinstall on 5 other computers to fix a problem Avast created? Not good.

Here’s a reply just received from Avast on this issue:

http://screencast-o-matic.com/screenshots/u/Lh/1492611316235-25580.png

I have struggled with this issue for a week, access to my NAS has and all internal resources have been blocked. I replaced the router with an old 100 Meg router and everything worked, logical assumption was that it was that the original router that had a problem. I then replaced the original router with a shiny new router, and shazam connectivity failed within a short period of time, I have pulled my hair out and tonight I came across an anomaly, I couldn’t access any internal network items or any internet sites except believe it or not Facebook. It struck me that the Avast firewall could be an issue. Turned it off and the world came back, plus my internal network.

The old router I tried as part of the fault elimination had an internal address range of 192.168.20.x. If I hadn’t turned the firewall off that was my next replacement item…

Note: Micro Update fixing Websites blocked by Firewall Port scan detection has just been released for AVAST. You can get this update immediately by rebooting and waiting ~ 5 minutes, otherwise it will arrive automatically in 12 hours (max).

Thanks, but no change for me after updating. Avast Firewall still cryptically blocking the same safe sites after a couple minutes of browsing.

Did you restart your Computer after updating?

DJBone

Yes I did. But since you asked that, I restarted the machine a second time, and the problem may have resolved. Possibly the first reboot only initiated the update, and the second reboot finished the install of the fix. Either way, the URL’s in question are now browsing with dramatically less latency, and no firewall blocking so far.

Will post here again later if these results prove short-lived.

yes , it’s like this , after update we could see in UI (update tab) → you need to restart your computer to finalize the installation or upgrade