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SqueezeCenter
Port 9000 is primarily used by Logitech SqueezeCenter (formerly SlimServer) to provide its web-based user interface and stream audio content to Squeezebox devices and clients. This application allows users to manage, control, and access their music libraries remotely through an intuitive web portal and facilitates network audio streaming..
Port 9000 serves as the default web interface and streaming endpoint for Logitech SqueezeCenter, a popular open-source media server aimed at streaming digital music to hardware devices like the Squeezebox, software players, and networked endpoints. The web server hosted on this port offers library management, playback controls, playlist editing, plugin management, and system configuration features accessible through standard browsers.
Technically, SqueezeCenter is implemented using Perl scripts that generate the web interface and manage audio streams. While the server mostly uses HTTP on this port to interact with clients and serve web content, it also multiplexes audio streams over HTTP, making it straightforward for compatible devices to receive network-based playback control and media delivery.
Port 9000 communication is primarily over TCP, providing reliable delivery for web requests and streaming. It is unofficial as it's not an assigned port by the IANA, but it’s widely adopted in the Slim Devices / Logitech ecosystem as the de facto standard port for these services, which has resulted in broad client and plugin support built around it.