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X11 Display Manager
Port 6001 is commonly used by the X Window System (X11), a windowing system for bitmap displays, primarily on UNIX and UNIX-like operating systems. It enables graphical user interfaces (GUIs) to be used over network connections by transmitting display data between an X server and X client applications. Each additional display instance typically uses an incremental port from 6000, meaning port 6001 corresponds to the second X11 display..
X11, or the X Window System, is a network-transparent windowing system designed to facilitate graphical user interfaces in UNIX and UNIX-like environments. It operates using a client-server model, where the X server manages display input/output hardware, and clients are applications requiring graphical output. Communication occurs over TCP or UDP ports starting at 6000. Specifically, port 6001 traditionally corresponds to the second display instance (DISPLAY=:1).
X11's protocol supports a range of graphical operations, such as rendering fonts, drawing windows, handling input events, and managing window characteristics. Because it is network-transparent, X11 allows applications running on one machine to display graphical output on different hosts within the same network, promoting flexibility for remote operations and multi-user setups in UNIX systems.
By default, X11 communicates in cleartext without encryption, transmitting all display commands and inputs across the network unprotected. Extensions like XRender and XShm enhance functionality, while SSH or dedicated tools like Xpra and VNC are often used to encapsulate or redirect X11 traffic securely.