# 177 - XDMCP **Scan:** ``` root@kali:~# nmap -sU 192.168.0.42 Starting Nmap 7.80 ( https://nmap.org ) at 2020-01-22 14:57 GMT Nmap scan report for 192.168.0.42 Host is up (0.00065s latency). Not shown: 999 open|filtered ports PORT STATE SERVICE 177/udp open xdmcp Nmap done: 1 IP address (1 host up) scanned in 4.27 seconds ``` ### **Nmap:** ``` nmap -sU -p 177 --script xdmcp-discover PORT STATE SERVICE 177/udp open|filtered xdmcp | xdmcp-discover: | Session id: 0x0000703E | Authorization name: MIT-MAGIC-COOKIE-1 |_ Authorization data: c282137c9bf8e2af88879e6eaa922326 ``` ### Xepher `Xephyr -from 192.168.0.42 -query 192.168.0.41 -screen 800x600 :1` Note: Make sure you add '-from', if not added the XDMCP won't know where to send the screen back to. ### Remmina install xdmcp support: `Apt install remmina-plugin-xdmcp` Press 'new connection profile' and change protocol to XDMCP ### Xnest Install: `apt-get install xnest` Run: `Xnest -ac -query ip_address :1 -geometry 1024x768` ### **Enable XDMCP on Ubuntu host** Ubuntu 12.04 LTS uses lightdm by default. XDMCP is disabled by default but can be enabled by adding the following to "/etc/lightdm/lightdm.conf": ``` [XDMCPServer] enabled=true ``` Restart lightdm after this: `sudo restart lightdm` and execute: xhost + --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://infra.newerasec.com/infrastructure-testing/enumeration/services-ports/xdmcp.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.