During November 2025, Matthias focused on stabilizing the IPv6 dual-stack nginx proxy within the home-assistant/addons repository. He addressed a critical networking issue by restoring IPv6 listening for the nginx proxy and refining the dual-stack configuration to ensure IPv4 behavior was preserved when IPv6 was enabled. Working primarily with nginx and YAML, Matthias validated the changes using nginx configuration testing to prevent false positives and ensure robust deployment. His DevOps expertise was evident in the careful patch path, which reduced post-release support incidents and improved reliability for users deploying the addon proxy in complex dual-stack network environments.