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RunUO Ultima Online
**RunUO** is an emulator server software for the popular MMORPG *Ultima Online*. It allows users to host private shards (servers) emulating the original game's experience, customized worlds, or entirely novel gameplay tailored to communities..
Port 2593 is primarily used for client-server communication in custom or emulated Ultima Online environments running the RunUO server. Clients connect over TCP/UDP to authenticate, manage sessions, and exchange gameplay data in real-time. The server emulates the official EA/OSI Ultima Online protocol, facilitating seamless compatibility with game clients while supporting extensive server-side customization.
RunUO is developed with extensibility in mind, primarily utilizing C#/.NET for scripting game logic. This enables shard administrators to create rich custom content, automate administrative tasks, integrate with web services, and control network interactions. The port's openness to both TCP and UDP allows flexibility and performance tuning for low latency and reliability in player actions and world state updates.
Given its unofficial nature, this service usually runs on private networks or community-hosted servers. It's not standardized by IANA but is widely adopted in the Ultima Online emulation community. The protocol running over this port resembles the original Ultima Online protocol but may vary between server versions and custom builds.