During June 2026, contributed to the antrea-io/antrea repository by addressing a critical socket leak in the NPL AddRule workflow. Focused on backend development using Go, the work introduced robust error handling to ensure sockets were properly closed when iptables rule installation failed, preventing stale references and double-closes. Comprehensive tests were added to verify socket lifecycle and port cache consistency across success and error scenarios, including iptables failures and duplicate entries. Enhancements to error logging improved diagnostics without masking original errors. These changes strengthened port management reliability, reduced resource leakage, and improved maintainability through updated documentation and expanded test coverage.