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Intermittent Internet Outage due to DNS error

hi,
i have XG210 with V18 Mr5, my clients are in LAN zone and Domain controller/DNS is placed in DMZ. dns address of client end is domain
contorller. when user want to go to internet then 1st of all for dns resolution it goes DNS server placed in DMZ and then it. then it browse
from last few days i am facing that
there is intermittent Internet outage. it shows me that DNS probe error in browser. can you please guide me how to dig out that firewall is not
diturbing this traffic.

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exion eh over 2 years ago in reply to Madni Malik +3

HI Madni , If you closely look into the Drop packet logs : Date=2021-07-30 Time=13:57:33 log_id=0110021 log_type=Firewall log_component=Identity log_subtype=Denied log_status=N/A log_priority=Alert…

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0 FormerMember over 2 years ago

Hi Madni Malik,

Thank you for reaching out to Sophos Community.

Do you see any drops on port 53 at the time of instance?

==> Run the below command in console to check drops.

console> drop-packet-capture 'port 53

==> Is UDP flood enabled under DoS?
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0 Madni Malik over 2 years ago in reply to FormerMember

thanks for reply.

let me check this. i also turn off IPS on rule LAN to DMZ and observing it too.
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0 Madni Malik over 2 years ago in reply to FormerMember

thanks for reply.

let me check this. i also turn off IPS on rule LAN to DMZ and observing it too.
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