dns issue

[panos]

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

[OtakarKlier]

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.

[panos]

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

[vsys_remo]

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?

[panos]

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

[vsys_remo]

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