During February 2025, Theo de Raadt focused on security hardening in the PowerShell/openssh-portable repository, addressing hostname validation to mitigate parsing failures and security risks. He implemented a targeted fix in C to reject hostnames containing commas, thereby reducing potential vulnerabilities and aligning with upstream standards. Theo collaborated closely with upstream maintainers, following a proposal from David to ensure the change was adopted across platforms. His work emphasized input validation and network security, involving code review and cross-repository coordination. This contribution improved the reliability and security posture of hostname handling, demonstrating depth in both technical execution and collaborative development processes.