Internet TCP port 177 is primarily used by the X Display Manager Control Protocol (XDMCP). This protocol is a part of the X Window System, which provides a basis for graphical user interfaces on Unix and Unix-like operating systems. XDMCP allows for the remote management of these displays, facilitating the start of a session which can be displayed on a remote X server. Examples of software that use this protocol include the GDM (GNOME Display Manager) and LightDM.
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