Proxy firewalls are proxy servers that work as gateway firewalls. They operate at the application layer between internal clients and web servers and can control and limit access to specific websites and web services
. A proxy firewall can monitor
at theapplication layer. It works with stateful packet inspection (SPI) and deep packet inspection
(DPI) and monitors incoming traffic. Like proxy servers, proxy firewalls work as a mediator and prevent direct contact between different systems. They have their own IP addresses and use them to receive data packets, which they then forward to the destination address via a new connection. Proxy firewalls have extensive monitoring functions in which they document the connections and security problems for security management.