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Consumer Products => Avast Free Antivirus / Premium Security (legacy Pro Antivirus, Internet Security, Premier) => Topic started by: Dwarden on November 17, 2015, 04:43:49 AM

Title: Avast 11.1.2241-11.2.2261 random bug preventing DNS resolve
Post by: Dwarden 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
Title: Re: Avast 11.1.2241 random bug preventing DNS resolve
Post by: Be Secure 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 (https://forum.avast.com/index.php?topic=179067.0)
+ Fixes in SecureDNS.If problem is slove :)
Title: Re: Avast 11.1.2241 random bug preventing DNS resolve
Post by: Dwarden on November 17, 2015, 05:35:50 PM
thanks will give it try ... those issues were really worrysome
Title: Re: Avast 11.1.2241 random bug preventing DNS resolve
Post by: Dwarden on November 27, 2015, 09:28:03 AM
unfortunately, this isn't fixed in beta 2016.11.2244
Title: Re: Avast 11.1.2241 random bug preventing DNS resolve
Post by: lukor 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?
Title: Re: Avast 11.1.2241 random bug preventing DNS resolve
Post by: Dwarden 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
Title: Re: Avast 11.1.2241 random bug preventing DNS resolve
Post by: Lisandro 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?
Title: Re: Avast 11.1.2241 random bug preventing DNS resolve
Post by: Dwarden on December 03, 2015, 11:45:25 PM
still unfixed in 11.1.2245 ... seriously dissapointed
Title: Re: Avast 11.1.2241 random bug preventing DNS resolve
Post by: Dwarden 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)

Title: Re: Avast 11.1.2241 random bug preventing DNS resolve
Post by: Dwarden on February 17, 2016, 09:18:08 PM
still unfixed in 11.1.2253
Title: Re: Avast 11.1.2241 random bug preventing DNS resolve
Post by: bob3160 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 ???
Title: Re: Avast 11.1.2241 random bug preventing DNS resolve
Post by: MartinK 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.
Title: Re: Avast 11.1.2241 random bug preventing DNS resolve
Post by: Dwarden 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
Title: Re: Avast 11.1.2241 - 11.2.2260 random bug preventing DNS resolve
Post by: Dwarden on April 06, 2016, 07:51:44 PM
still unfixed https://forum.avast.com/index.php?topic=185203.0

note: not using EMET atm.
Title: Re: Avast 11.1.2241-11.2.2260 random bug preventing DNS resolve
Post by: Dwarden 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.
Title: Re: Avast 11.1.2241-11.2.2261 random bug preventing DNS resolve
Post by: Coolmario88 on April 20, 2016, 05:56:41 AM
I don't know if i am having the same issue, my Wifi is working perfectly and last night and just a few seconds ago i was disconnected from irc.geekshed.net and couldn't connect to youtube it said in chrome a DNs problem.. I waited 3 seconds and got back on and still had wifi connection..