Proxy controls are rules or settings that force outbound network traffic through a filtering or monitoring relay, such as a corporate proxy, security gateway, or egress inspection service. They can block risky destinations, log requests, and apply authentication or content checks before traffic leaves a host or network.
In cyber security, proxy controls matter because they help enforce outbound policy even when an application tries to reach external systems. They are often used to reduce data exfiltration, limit access to internal services, and hinder server-side request forgery (SSRF) by preventing direct connections to sensitive targets. In attacks, threat actors may try to bypass proxy controls by using alternate protocols, hardcoded IPs, custom DNS behavior, or library code paths that do not honor the expected routing rules. Defenders should treat proxy settings as one layer of control and back them up with explicit destination allowlists, network egress restrictions, and verification that the actual transport path is inspected.