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Questions tagged [xdmcp]

X Display Manager Control Protocol

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Debian/Gnome in xdmcp - Hot Corner does not work

X Server: Cygwin/X fullscreen on Windows 11 X Client: Gnome desktop on Debian 12.5 I realize this could be an issue with Cygwin/X, but I'd like to confirm that this is not a problem with xdmcp ...
Ex Umbris's user avatar
  • 274
0 votes
2 answers
62 views

Why the tunnel Xdmcp+ssh don't work?

I want to tunnel via ssh a Xdmcp protocol. To access sicure to a remote login. An easy solution can be openvpn, but I want to try socat+ssh first. The server is Solaris 10 The client is Slackware 15. ...
elbarna's user avatar
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1 vote
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259 views

lightdm: neither xdmcp nor vnc providing remote session

I want to be able to connect remotely to my daily driver (Debian 11) within my LAN from my laptop and other devices. Ssh works fine but niether Chrome nor Firefox are happy running over ssh / some ...
symcbean's user avatar
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305 views

Connecting via VCXSRV leads to a blank screen

When trying to use vcxsrv on my laptop I am unable to remotely connect to a Linux system. I just get a blank screen during the remote connection attempt. I have captured the log file as shown below: ...
hymcode's user avatar
  • 93
1 vote
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94 views

XDMCP locally using Unix sockets

Is there any way to start a XDMCP session, say with Xephyr in LightDM, locally through Unix Sockets instead of IP? For performance I was wondering if, somehow, I can avoid any network stack working ...
igorkattar's user avatar
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237 views

blank window with XDMCP between linux and unix

I have a Digital Unix 4.0 emulation running without a display (FreeAXP). I have an X app (Open Genera 2) on this host that I would like to use. I managed to configure both Unix and Linux and I can do ...
mete's user avatar
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1 vote
0 answers
171 views

Can XDMCP be encrypted with RSA or AES? Can XDMCP be forwarded over SSL or TLS?

I know XDMCP cannot be forwarded over SSH because XDMCP uses UDP and SSH uses TCP. Can XDMCP be forwarded over SSL or TLS instead? XDMCP is not encrypted by default. Can AES or RSA be added to XDMCP ...
Jonathan Dahlin's user avatar
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1 answer
254 views

How to choose "remote login via xdmcp" at the login window in RHEL6/7?

In RHEL5, I can press F10 to choose "remote login via xdmcp" at the login window, how to do the same thing in RHEL6/7?
Jimmy's user avatar
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1 vote
1 answer
478 views

How to use XDMCP when server and client are behind two NAT?

The network structure is: Server -> NAT router1 -> switch <- NAT router2 <- Client The part I cannot solve is that, after xserver connects to 177/udp of xdm, xdm connects back to xserver, say ...
Magicloud's user avatar
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0 votes
1 answer
263 views

Is it possible to provide XDMCP service off screen?

Providing XDMCP service itself is not hard. Some configuration with XDM is enough. But XDM has to start a X process and show something, if there is some hardware issues, it tails to start. While in ...
Magicloud's user avatar
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2 votes
1 answer
917 views

How do I avoid colour channel issues with 24-bit colour remote X11 with older Solaris?

When using CDE on older Solaris systems (2.5.x) remotely using XDMCP with TrueColor visuals, on-screen pixmaps are missing the blue channel and have the red and green channels swapped. This means ...
rakslice's user avatar
  • 1,177
0 votes
1 answer
1k views

Set up xdmcp for remote desktop forcing udp v4

I am trying to set up remote desktop into a Debian stretch distribution, I set up the file /etc/gdm3/daemon.conf. [daemon] WaylandEnable = false [security] DisallowTCP = false [xdmcp] Enable = true ...
user avatar
3 votes
2 answers
7k views

Why do I need XDMCP to start a remote X session over SSH?

I'm trying to set up a remote desktop connection to access my desktop PC from my laptop (both running Trisquel) over wifi. I've tried VNC and it was terribly slow, so I'm looking at alternative ...
Time4Tea's user avatar
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0 votes
1 answer
456 views

How is xdm configured for redhat 6?

I am trying to get xdmcp working on a Redhat 6 server. I am mostly following the steps at: http://www.yolinux.com/TUTORIALS/GDM_XDMCP.html#RHEL In one of the steps it suggests: Edit file: Red Hat: /...
user55570's user avatar
  • 320
2 votes
1 answer
14k views

Export Display is not working on Ubuntu Gnome (gmd3)

When I try to export the remote display I do: In my Ubuntu 17.04: xhost + access control disabled, clients can connect from any host Then I make the connection to the server: ssh user@server Once ...
bLuEdDy's user avatar
  • 99
3 votes
0 answers
652 views

XDMCP "maximum number of open sessions from your host reached" but no session is active

I'm using XDMCP to access CentOS 6 hosts from Cygwin/X. Everything works fine, but every now and then attempting to connect results in the error message: XDMCP fatal error: Session declined maximum ...
Nicola Musatti's user avatar
2 votes
1 answer
6k views

How to resolve black screen issue with Xnest/XDMCP

My environment consist of a Ubuntu 14.04 LTS VM. This is acting as the Xnest server on socket :2 and port 6002 (as seen by netstat). I'm running the Xnest as client on a Fedora 20 VM. The Ubuntu ...
user53029's user avatar
  • 2,843
3 votes
1 answer
4k views

Configure XDM to accept remote logins

How can I configure XDM server to accept remote X login and works as X server, which Configuration should be done on the clients if they want to connect to this X server?
Shahram Pezeshki's user avatar
2 votes
1 answer
298 views

how to 'forward' x display data?

this is my situation: there are three computers lab server (CentOS) lab personal computer(window s7) personal laptop(ubuntu) since the lab server only allowed ip address of my desktop at the lab, I ...
kwagjj's user avatar
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5 votes
1 answer
11k views

where can I find the MIT-MAGIC-COOKIE in the user side?

While digging into X Windows or X11 stuff I found that X display uses MIT-MAGIC-COOKIE to allow client-server to exchange display data. One thing I don't understand is that I am able to locate and ...
kwagjj's user avatar
  • 2,319
4 votes
2 answers
19k views

How to configure fonts on a remote X connection (XDMCP vs. ssh)?

Connecting to a remote Solaris 10 system over X11 I observe inconsistent behavior regarding the used fonts. I am connecting from a Cygwin/X system. When I connect using ssh forwarding like this $ ...
maxschlepzig's user avatar
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1 vote
1 answer
4k views

Opening session via XDMCP to GDM

I have a RHEL6 server which we connect via XDMCP. If I start xdm (xdm &) it works but the login screen is the old xdm simple login and not gdm. Our RHEL5 servers connect to gdm just fine. The ...
Jeight's user avatar
  • 2,643