What happens if Dynamic Block List server is inaccessible?

Showing results for 
Show  only  | Search instead for 
Did you mean: 
Please sign in to see details of an important advisory in our Customer Advisories area.

What happens if Dynamic Block List server is inaccessible?

L4 Transporter

If we are retrieving a list of IP's via Dynamic Block List to Allow and/or Deny traffic, what would happen if the web server hosting the .txt file is inaccessible during a refresh? Would the DBL object lose all of the IP addresses and render the rule using it useless?


L5 Sessionator


No, it'll use the previous refresh output results(If that was successful) or the previous cached output.


Hari Yadavalli

L6 Presenter

Hi Jambulo,

It will use old cached entries if web-server doesnt respond


Hardik SHah

L7 Applicator

The Palo Alto tech doc noting the cache usage behavior.

What Happens if the Server Configured for Dynamic Block Lists Becomes Unreachable?

Working with External Block List (EBL) Formats and Limitations

Steve Puluka BSEET - IP Architect - DQE Communications (Metro Ethernet/ISP)
ACE PanOS 6; ACE PanOS 7; ASE 3.0; PSE 7.0 Foundations & Associate in Platform; Cyber Security; Data Center
  • 3 replies
Like what you see?

Show your appreciation!

Click Like if a post is helpful to you or if you just want to show your support.

Click Accept as Solution to acknowledge that the answer to your question has been provided.

The button appears next to the replies on topics you’ve started. The member who gave the solution and all future visitors to this topic will appreciate it!

These simple actions take just seconds of your time, but go a long way in showing appreciation for community members and the LIVEcommunity as a whole!

The LIVEcommunity thanks you for your participation!