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The Firefox web clients on the workstations are configured to use the firewall as explicit web proxy.
The firewalls (in cluster mode) are configured to use the customer's proxy as an explicit web proxy for all URLs. Consequently, the SRX1500 firewall, acting as an explicit web proxy, does not perform DNS resolution for the target web servers; only the customer's web proxy does.
Given this scenario, could you please confirm if the SRX1500 (configured as an explicit web proxy) supports proxy chaining and allows the customer's proxy to be configured as an explicit web proxy to resolve DNS?