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Consumer Products => Avast Free Antivirus / Premium Security (legacy Pro Antivirus, Internet Security, Premier) => Topic started by: aibz on May 03, 2017, 05:38:29 PM

Title: [PROBLEM REPORT] Avast Internet Security is blocking our Windows server randomly
Post by: aibz on May 03, 2017, 05:38:29 PM: 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.
Title: Re: Avast Pro is blocking our Windows server randomly
Post by: Pondus on May 03, 2017, 05:42:08 PM: Quote
Avast Pro 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
Title: Re: Avast Pro is blocking our Windows server randomly
Post by: aibz on May 03, 2017, 05:55:59 PM: Quote from: Pondus on May 03, 2017, 05:42:08 PM
Quote
Avast Pro 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.
Title: Re: Avast Internet Security is blocking our Windows server randomly
Post by: Pondus on May 03, 2017, 06:00:12 PM: Does it help if you turn OFF port scan?

Avast UI -> Protection -> Firewall -> Settings -> Advanced -> Uncheck "Enable automatic port scan detection"
Title: Re: Avast Internet Security is blocking our Windows server randomly
Post by: aibz on May 03, 2017, 06:30:32 PM: Quote from: Pondus on May 03, 2017, 06:00:12 PM
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.
Title: Re: Avast Internet Security is blocking our Windows server randomly
Post by: aibz on May 03, 2017, 06:40:11 PM: 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?
Title: Re: Avast Internet Security is blocking our Windows server randomly
Post by: aibz on May 03, 2017, 07:04:53 PM: Quote from: Pondus on May 03, 2017, 06:00:12 PM
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
Title: Re: [PROBLEM REPORT] Avast Internet Security is blocking our Windows server randomly
Post by: Asyn on May 04, 2017, 06:45:54 AM: Follow instructions: https://www.avast.com/faq.php?article=AVKB33#artTitle
Title: Re: [PROBLEM REPORT] Avast Internet Security is blocking our Windows server randomly
Post by: NON on May 04, 2017, 08:09:51 AM: If you set Firewall profile to "Public", then try changing it to "Private". There was a case this solved similar issue.