With EDLS, what does the firewall do if the web server is unreachable?

In the context of EDLS (Extended Dynamic Load Sharing), when the web server is unreachable, the firewall uses the last successfully retrieved list. This approach ensures continuity in network operations, allowing traffic to be managed based on the most recent known and validated security policies or configurations. By relying on the last successfully retrieved list, the system can continue to function without disruption, helping maintain service availability while preventing complete traffic stoppage or the need to wait for restoration of connectivity to the web server. This strategy balances operational resilience with security protocols, which is essential in maintaining an efficient data center environment.