PA 3260 Policy Rule losing DNS resolution to FQDN-defined site - 4.19.23

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PA 3260 Policy Rule losing DNS resolution to FQDN-defined site - 4.19.23

L0 Member

We have a policy rule that contains an FQDN-defined website destination ( When initially configured to pass traffic to required cloud-based resources, DNS resolution to the site would happen regularly, usually after an hour or so. A Palo Alto knowledgebase article about the Fast-DNS caching used by cloud-based resources could be remediated by reducing the FQDN resolution time from the default from 30 minutes to 10 minutes. After the recommended change, the connection functioned normally for a 10-hour shift with no issues. After a few days we noticed that the connection would be lost overnight, and could only be resolved by "toggling" the policy rule, thereby renewing the connection. 


Is there a way to configure PAN-OS policy rules to ensure uninterrupted connection to the cloud-based resource, without having to manually renew the connection?


Fast-DNS Resolution Issues

How to change the FQDN Refresh Timers





L3 Networker

Hi Paul,


The 10 minutes in your case is probably too long if it is resulting in loss of connectivity after a certain period

since PAN-OS 9 the timeout can be reduced to seconds and that is probably what will fix the problem for you.

see this kb article.

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