Avast Premier Firewall Blocking Local Network Access (192.168.x.xxx)

Avast Free Antivirus / Premium Security
1

Since a recent Avast upgrade to Premier, the Avast firewall is blocking access to my 192.168.1.xxx addresses. I can’t access my network printer and my network server for backups. After a day of debugging, I traced the problem to PORT SCAN DETECTION in advanced settings for the firewall being turned on. If I tun it off everything runs normally. This is new behavior. I am on Premier version 17.3.2291 (build 17.3.3443.0) and Windows 10 Version 1607 (build 14393.969).

Is anyone else seeing this. I did a search and did not get any useful hits.

2

Avast UI → Protection → Firewall → Settings → Advanced → Uncheck “Enable automatic port scan detection”

Is anyone else seeing this. I did a search and did not get any useful hits.
There is a bug in port scan
3

Thank you for your reply!
I’ve noticed the same problem on my PC, but the firewall were blocking not only LAN IP-addresses, but some Internet sites.
After unchecking “Enable automatic port scan detection” the problem is solved.

I’m using Avast Internet Security, version 17.3.2291 (build 17.3.3443.0)

4

Thanks guys. The turning off port scan works as a temporary fix. I am also getting those alerts for programs trying to get to the internet… that never happened before. I’ll look for the “allow automatic port scan” feature. I did not see it under the premier version

Brian

5

I it is in the firewall settings, see Reply #1 for the location.

6

I just had a crazy set of AVAST Premier buggy behavior after upgrading from 8 GB to 16 GB (Win 10 1607). Avast went nuts blocking everything including my internet connection. I had to uninstall Premier and fall back to Internet Security. I have run AIS successfully for years… but back in mid-March I got talked into upgrading to premier. I have had problems ever since.