Author Topic: Avast 11.1.2241-11.2.2261 random bug preventing DNS resolve  (Read 7050 times)

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Offline Dwarden

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Avast 11.1.2241-11.2.2261 random bug preventing DNS resolve
« on: November 17, 2015, 04:43:49 AM »
Avast has very annoying bug which causes DNS resolve to cease work,
the only error indicating such in Event log is unable to resolve "ocsp.entrust.net"

stopping avast services and restarting them resolves this issues

it's extremely annoying as this happens random and causes various software freezes as they hang on the DNS resolving timeout ...

OS: Windows 7 SP2 x64
« Last Edit: April 20, 2016, 12:44:08 AM by Dwarden »
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Offline Be Secure

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Re: Avast 11.1.2241 random bug preventing DNS resolve
« Reply #1 on: November 17, 2015, 05:58:23 AM »
Hello Dwarden.Pls try out SP1 Beta 1 (2016.11.1.2242) of avast!https://forum.avast.com/index.php?topic=179067.0
+ Fixes in SecureDNS.If problem is slove :)
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Offline Dwarden

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Re: Avast 11.1.2241 random bug preventing DNS resolve
« Reply #2 on: November 17, 2015, 05:35:50 PM »
thanks will give it try ... those issues were really worrysome
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Offline Dwarden

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Re: Avast 11.1.2241 random bug preventing DNS resolve
« Reply #3 on: November 27, 2015, 09:28:03 AM »
unfortunately, this isn't fixed in beta 2016.11.2244
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Offline lukor

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Re: Avast 11.1.2241 random bug preventing DNS resolve
« Reply #4 on: November 27, 2015, 10:57:37 PM »
Dwarden, what about turning SecureDNS off. Wouldn't that help?

Does this happen only right after reboot/resume of the PC, or anytime during work?

Offline Dwarden

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Re: Avast 11.1.2241 random bug preventing DNS resolve
« Reply #5 on: November 28, 2015, 08:20:40 PM »
this is another error I get
Quote
Name resolution for the name domrep.ff.avast.com timed out after none of the configured DNS servers responded.

@lukor this is bug with Avast! free , afaik there is no Secure DNS in it ... (this is shame considering there're free opensource DNSsec solutions already)

it's happening random, multiple times per day ... restarting/terminating Avast! service usually fixes it

note: I'm using multiple DNS servers (my, ISP, Google, NIC etc.) .... so it's highly unlikely they all 'unreachable' at same time while rest of internet services works
« Last Edit: November 28, 2015, 08:22:41 PM by Dwarden »
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Offline Lisandro

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Re: Avast 11.1.2241 random bug preventing DNS resolve
« Reply #6 on: November 30, 2015, 03:07:42 PM »
Dwarden:
1. What are the settings for DNS Client service?
2. Do you use any hosts manager? Is your hosts file the default one?
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Offline Dwarden

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Re: Avast 11.1.2241 random bug preventing DNS resolve
« Reply #7 on: December 03, 2015, 11:45:25 PM »
still unfixed in 11.1.2245 ... seriously dissapointed
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Offline Dwarden

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Re: Avast 11.1.2241 random bug preventing DNS resolve
« Reply #8 on: December 03, 2015, 11:47:54 PM »
Dwarden:
1. What are the settings for DNS Client service?
2. Do you use any hosts manager? Is your hosts file the default one?

using Google DNS, Czech NIC as priority (DNSsec and other security improvements supported)
normal Windows 7 x64 SP1 with all updates

everything was fine until 11.1.x

yes I have some custom hosts file but it's just some static additions (i barely edit anything in it for some years)

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Offline Dwarden

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Re: Avast 11.1.2241 random bug preventing DNS resolve
« Reply #9 on: February 17, 2016, 09:18:08 PM »
still unfixed in 11.1.2253
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Offline bob3160

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Re: Avast 11.1.2241 random bug preventing DNS resolve
« Reply #10 on: February 18, 2016, 10:37:42 AM »
Dwarden:
1. What are the settings for DNS Client service?
2. Do you use any hosts manager? Is your hosts file the default one?

using Google DNS, Czech NIC as priority (DNSsec and other security improvements supported)
normal Windows 7 x64 SP1 with all updates

everything was fine until 11.1.x

yes I have some custom hosts file but it's just some static additions (i barely edit anything in it for some years)
Have you tried the default Host File to see if that makes a difference ???
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Offline MartinK

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Re: Avast 11.1.2241 random bug preventing DNS resolve
« Reply #11 on: February 18, 2016, 12:45:15 PM »
Dwarden, please try to turn off Web Shield for a while. We would like to know if it helps.

Offline Dwarden

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Re: Avast 11.1.2241 random bug preventing DNS resolve
« Reply #12 on: February 22, 2016, 07:06:24 PM »
I think it did but not 100% sure ,
the time until I had similar problem (but that could be just unlucky server/browser hiccup) was N times longer

note: I'm using EMET 5.2 just in case that's important
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Offline Dwarden

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Re: Avast 11.1.2241 - 11.2.2260 random bug preventing DNS resolve
« Reply #13 on: April 06, 2016, 07:51:44 PM »
still unfixed https://forum.avast.com/index.php?topic=185203.0

note: not using EMET atm.
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Offline Dwarden

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Re: Avast 11.1.2241-11.2.2260 random bug preventing DNS resolve
« Reply #14 on: April 19, 2016, 11:26:20 PM »
usually when Avast! has issue with DNS those events appear in Windows Event Log

Quote
DNS client events: There was an error while attempting to read the local hosts file.

and random domains related one
Quote
DNS client events: Name resolution for the name dsn13.d.skype.net timed out after none of the configured DNS servers responded.
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