topic Re: dns issue in General Topics

dns issue

Retired Member — Tue, 29 Jun 2021 08:32:07 GMT

Hi,

using an internal Dns server

client makes request for a domain ???.com and cannot get an answer.

from nslookup we see that it cannot resolve the domain.

internal dns server to public dns server rule has a spyware profile.

There is no threat log for this request.But if we disable spyware profile then client can resolve this name.

Any idea about this issue ?

we checked this domain in the lab but it is legal not suspicious.Thanks

Regards

Re: dns issue

Remo — Tue, 29 Jun 2021 12:52:11 GMT

Hi @Retired Member

Do you have the DNS security subscription enabled on that firewall? If yes, does your firewall have internet access (at least towards paloalto dns service)?

Re: dns issue

Retired Member — Tue, 29 Jun 2021 12:53:20 GMT

Hi,

license was trial and it is expired.

Regards

Re: dns issue

Remo — Tue, 29 Jun 2021 12:56:13 GMT

So in this case I assume this feature is still configured in the spyware profile?

Re: dns issue

Retired Member — Tue, 29 Jun 2021 12:57:39 GMT

is there a way to disable it ? All categories are selected as allow.

Re: dns issue

OtakarKlier — Tue, 29 Jun 2021 16:38:57 GMT

Hello,

Also check to see if the request is getting dropped into the sinkhole if configured. To disable DNS in the profile:

Objects tab -> Anti-Spyware-> click the profile name

DNS-Signature tab and change Action to Alert (alert allows the traffic and logs it, allow just allows the traffic but does not log it)

Hope it helps.

Re: dns issue

Retired Member — Tue, 29 Jun 2021 19:25:28 GMT

Thanks for reply.

no sinkhole ip is returned.cannot resolve the domain.

we checked counters also for dns server's traffic,there is no drop.but clients cannot resolve the domain when spyware profile is selected.

Added the domain to Dns exceptions tab but again same issue.

I opened a Tac case.Let's see what they will find.

Regards

Re: dns issue

Remo — Tue, 29 Jun 2021 20:27:29 GMT

Maybe it is worth a try to delete the dns security license as it is expired anyway.

Did you check the system logs to see if there are some logs which could lead to the reason of this issue?

Re: dns issue

Retired Member — Tue, 29 Jun 2021 20:37:54 GMT

Hi,

Thanks,

there were logs saying that " critical general general 0 License for feature dns-security expired on ..." so we deleted license from cli but it did not change anything.

Regards

Re: dns issue

Remo — Tue, 29 Jun 2021 21:06:48 GMT

Did you try to add a newly created antispyware profile to that rule where you do not configure the dns security options at all?

Re: dns issue

Retired Member — Tue, 29 Jun 2021 21:09:54 GMT

Yes this option was our last test.

We cteated a fresh profile but again faced same issue.

Thanks

Regards

Re: dns issue

Retired Member — Fri, 02 Jul 2021 09:15:28 GMT

Hi,

this is a known bug which will be fixed in 10.0.7

just confirmed.

Regards