![]() Therefore, only use XDMCP on a wired network that you you trust. Over both, it is still somewhat easy for someone hijack your session and assume control of the sever. Over a wired LAN, this is more difficult but still possible. They can likely read what is being display on your screen. Over wireless, anyone can listen to your traffic and easily record your keystrokes. XDMCP is analogous to telnet, and therefore they share the same security issues. XDMCP is inherently insecure as it does not encrypt your traffic. XDMCP also needs to be implemented by the display manager. XDMCP is integrated into X.org, the default X11 server in Ubuntu. With XDMCP, one computer A running X11 can connecting computer B running X11, and interact with computer B as if one were physically at computer B.
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