[PROBLEM REPORT] Avast Internet Security is blocking our Windows server randomly

aibz · 2017-05-03T15:38:29.000Z

Avast Internet Security version 17.4.2294 (release date 5/3/2017)

We have a small Windows network, single subnet, Windows 2012r2 AD server. This network/server has been running for the last 2 years.

We have used Avast Internet Security on our desktops for 3+ years.

As of about 2 months ago:

Randomly, server will “disappear”. No ping, no windows browsing, nothing.

Pinging all other devices works fine. Server can ping everyone just fine except affected desktops.

Disabling Avast is the only way to bring it back.

I have removed and re-installed Avast. Version is current as of 10 minutes ago.

WTH else can I do? Avast firewall CLEARLY does not like our windows server.

Pondus · 2017-05-03T15:42:08.000Z

Avast [b]Pro[/b] version 17.4.2294 (release date 5/3/2017)

Avast free and pro does not have a firewall

Avast Premier and Avast Internet Security have firewall

aibz · 2017-05-03T15:55:59.000Z

Pondus post:2:

Avast [b]Pro[/b] version 17.4.2294 (release date 5/3/2017)
Avast free and pro does not have a firewall
Avast Premier and Avast Internet Security have firewall

Corrected. We have Avast Internet Security.

Pondus · 2017-05-03T16:00:12.000Z

Does it help if you turn OFF port scan?

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

aibz · 2017-05-03T16:30:32.000Z

Pondus post:4:

Does it help if you turn OFF port scan?

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

i’ll try that.

aibz · 2017-05-03T16:40:11.000Z

Here is the firewall log.

192.168.1.10 is the server (hosts DNS)
192.168.1.250 is the desktop system

These are the blocked traffic logs.

192.168.1.0 - 192.168.1.255 is listed as a friendly network. nothing should be blocked.

why is it blocking my server?

aibz · 2017-05-03T17:04:53.000Z

Pondus post:4:

Does it help if you turn OFF port scan?

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

i changed it and rebooted. no good.

still blocking our local windows server.

it “unblocks” when i disable all the avast shields/fw

Asyn · 2017-05-04T04:45:54.000Z

Follow instructions: https://www.avast.com/faq.php?article=AVKB33#artTitle

NON · 2017-05-04T06:09:51.000Z

If you set Firewall profile to “Public”, then try changing it to “Private”. There was a case this solved similar issue.

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