Port 12035

Second Life, developed by Linden Lab, is a persistent online virtual environment where users can socialize, create content, and engage in economic transactions. The Second Life Viewer client connects to multiple server components, including region simulators (sims), asset servers, and authentication services. Port 12035 is typically associated with UDP communication between the viewer and sim servers, facilitating fast and lightweight data transmission for world updates.

The UDP protocol on this port is primarily used for real-time streaming of avatar movements, object positions, chat data, and environmental state changes. Unlike TCP connections used for login or asset downloading, UDP supports low-latency, connectionless messaging suited for constant-world synchronization. This structure helps maintain the responsiveness essential for user experience while managing fluctuating network conditions.

Due to its role in synchronizing dynamic world data, this port mainly handles ephemeral, stateless packets that are frequently updated. The communication model is optimized for speed over reliability, accepting occasional packet loss without significant user impact. This design choice allows Second Life to scale across diverse network conditions and large user bases.