Zentyal Forum, Linux Small Business Server

Zentyal Server => Installation and Upgrades => Topic started by: Maekar on December 04, 2019, 11:18:36 am

Title: [SOLVED] DNS error with Youtube after 6.1 update
Post by: Maekar on December 04, 2019, 11:18:36 am

Hi,

I have Zentyal as PDC for Windows clients and the DNS is in forwarder mode (to the router). Since 6.1 update, a lot of computers are experiencing randomly fails when enter in Youtube website. The browser display a network DNS error, but if I change the primary DNS (to our router directly or any external DNS like Google), everything runs okay.
Of course, this only happens in machines with Zentyal as primary DNS server. Other devices in our network have no problems at all.

Thanks in advance

EDIT: For clarify, I've detected problems with Youtube because we use it a lot, but I don't say everything else is ok. Clearly something is broken with DNS queries and domain clients since 6.1 update.

Title: Re: DNS error with Youtube after 6.1 update
Post by: Maekar on December 04, 2019, 01:36:11 pm

In /var/log/syslog I see these lines frequently (I omited hostname and domain name), I don't know if are related with the issue. Some updates are ok but others:

Dec  4 13:29:59 zentyal named[1449]: samba_dlz: disallowing update of signer=XXX\$\@XXX.LAN name=xxxxx type=AAAA error=insufficient access rights
Dec  4 13:29:59 zentyal named[1449]: client @0x7fa558033c90 10.0.1.157#56597/key xxx\$\@xxx.LAN: updating zone xxxx.lan/NONE': update failed: rejected by secure update (REFUSED)
Dec  4 13:29:59 zentyal named[1449]: samba_dlz: cancelling transaction on zone xxxx.lan

Sorry if doesn't help, is the only thing look like an error to me...

Thanks

Title: Re: DNS error with Youtube after 6.1 update
Post by: doncamilo on December 04, 2019, 02:56:03 pm

 :)

First use rndc to clear the DNS cache:

Code: [Select]

sudo rndc flush
sudo rndc reload

Check your forwarder:

Code: [Select]

dig @localhost www.some-extrange-domain.com

Check your forwarder with the youtube.com site:

Code: [Select]

dig @localhost youtube.com

I think that your DNS could have some deprecated DNS records in the cache. It should fix it.

Cheers!

Title: Re: DNS error with Youtube after 6.1 update
Post by: Maekar on December 11, 2019, 10:22:27 am

I did it and one week later I have no complaints, I think it's solved.

Thanks for the help @doncamilo  :D