DNS Security does not work after configuration
4087
Created On 11/11/24 16:00 PM - Last Modified 12/01/24 13:10 PM
Symptom
- The DNS traffic is passing through a security policy with Anti-spyware configured.
- Anti-spyware DNS security is configured with an action block for malicious domains ( phishing, malware, C2, .. etc )
- when doing nslookup for a malicious site from the client machine to the DNS resolver, the query passes through without detection where it should
- Checking the global counters, no increase in ctd_dns counters.
- Noticing only the below counters:
> show counter global | match ctd_dns ctd_dns_id_update 3 0 info ctd pktproc Number of DNS id update from MP ctd_dns_response_error 694894 0 error ctd pktproc Number of Error DNS response from MP
Environment
- Palo Alto Firewalls
- PAN-OS 10.1
- DNS Security
Cause
The config from the GUI for the antispyware profile is not applied. The running config does not reflect the configured profile.
Resolution
- Make a simple change related to the DNS security config on the Anti-Spyware profile.
- Commit the config.
- Revert the modified change (The change is just done to populate the DNS security config on the running config)
- Commit the changes again.