Software :: Connect To Via Xdmcp Or Freenx From These Clients?

Jun 25, 2010

We have a lab at our school that has DevonIT thin clients. We want to connect to Ubuntu via xdmcp or freenx from these clients, and we want users to be able to connect to our Novell file server from these clients. I can't find instructions on how to install the client, which I found at It is a tar.gz file. I'm not new to Linux, but rarely install apps from source. Could someone walk me through it, keeping in mind I do not use the command line much? [URL]..

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Debian Multimedia :: Connect From Remmina To Jessie On Another System Via Xdmcp - Only Black Screen Happen

Jul 16, 2015

I want connect from remmina to jessie on another system via xdmcp but only black screen happened.

my daemon.conf
Code: Select all[security]


Enable = true

And gdm3 listen on udp/177. My syslog :

Code: Select allJul 16 10:17:46 office /usr/bin/dbus-launch[1455]: X Error of failed request:  BadValue (integer parameter out of range for operation)
Jul 16 10:17:46 office /usr/bin/dbus-launch[1455]: Major opcode of failed request:  140 (RANDR)
Jul 16 10:17:46 office /usr/bin/dbus-launch[1455]: Minor opcode of failed request:  7 (RRSetScreenSize)
Jul 16 10:17:46 office /usr/bin/dbus-launch[1455]: Value in failed request:  0x0
Jul 16 10:17:46 office /usr/bin/dbus-launch[1455]: Serial number of failed request:  150

[Code] ....

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CentOS 5 Networking :: FreeNX - Cannot Get It To Connect?

Feb 12, 2010

I am usually the last one to post on forums, but I can't for the life of me get FreeNX working on my CentOS box. I have also read many posts, many how-to's, many troubleshooting guides, and absolutely nothing is working for me. It's Crazy. First of all, I've installed FreeNX before, with little to no trouble. I am not completely green at the linux command line, but I am still no expert. I'm hoping one of you guru's out there can lend me a bit of a hand.

Here goes, I've installed FreeNX onto my CentOS 5.4 dedicated box, using the how-to [URL].. I've done everything, letter by letter, on the how-to. (Installed CentOS, configured sshd_config, added users in AllowUsers, created nx user, imported keys.. etc) At this point, I could not connect to my box, with the error message:

NX> 203 NXSSH running with pid: 336
NX> 285 Enabling check on switch command
NX> 285 Enabling skip of SSH config files
NX> 285 Setting the preferred NX options


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Ubuntu Networking :: Can't Connect To FreeNX Server From NoMachine

Feb 18, 2011

I have installed nomachine on my windows 7 laptop and when I connect to the server I receive the error message:

"Authentication failed for user [username]"

Which user am I supposed to log in with? Is it the same user as I use on the server or is this a separate nx user? When I receive this message is it because of the user or the ssh key I use?

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General :: Calling All FreeNX - Cannot Connect The Macbook's NX Client To The Server

May 2, 2010

I am trying (desperately) to setup freeNX so that I can access my Mandriva box from my Macbook over my network. I have great need to be able to do this. Here's the necessary info for you: Mandriva PC: running Mandriva 2010.0 with freeNX installed from the Mandriva repos Macbook: running OS 10.4 with the Nomachine NX Client installed Now, I have followed the setup from the Mandriva wiki as well as the freenx wiki to no avail. I simply cannot connect the Macbook's NX client to the server. I get an authentication failed message. However, I can ssh from the Macbook to the server just fine (that's how I'm getting most of this work done).


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Ubuntu Networking :: Make Connect To Freenx Server From Windows Using Nomachine Client?

Feb 24, 2010

I am not exactly newbie with GNU/Linux, but definitely new to SSH/NX stuffs. I followed the below tutorials for installing FreeNX so that I can access my desktop like TeamViewer in windows.


But I don't see the folder NX like the one mentioned here.Then edit the file /usr/NX/etc/server.cfg

I don't see a folder called NX to proceed. Also when I use nomachine client to connect from Windows, it couldn't connect and I get the below errors.

nxssh: <host-name>: no address associated with name.

how to make connect to freenx server from windows using nomachine client?

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Ubuntu :: Only Authorized Clients Can Connect - GDM?

May 2, 2010

When I input xhost
pt@pt-laptop:~$ xhost
access control enabled, only authorized clients can connect
wWo is gdm? Is he a hacker?

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Ubuntu :: Synergy Will Not Connect To 10.04 Clients?

Jul 15, 2010

I've been using synergy for a while and love it. I recently upgraded both of my desktop PCs at home from 9.10 to 10.04 (both x64 ubuntu studio). Now, Synergy doesn't appear to want to work. I've tested with both the cli command referencing a config file on the server and using quicksynergy on both machines and it just doesn't connect. I verified on my "server" that synergy is listening on port 24800 (can telnet to that port from the client machine). I manually disabled the firewall on both machines as well and it doesn't seem to make a difference. It never gives an error on the client, it just never makes the connection. I've tested this with 2 separate 10.04 clients. I also brought one of these boxes (a laptop) to work where I use Synergy between 2 windows boxes. It won't connect to those either.

I've tried connecting both using hostname and IP address (both worked in the past on 9.10) and neither work.

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Fedora Servers :: Samba Will Not Allow Any Clients To Connect ?

May 17, 2010

I've done this before, maybe ten times. This time is different. I don't know why, but Samba will not allow any clients to connect.

I've done:
- installed samba
- setup the samba shares
- have a samba user/passwd
- authentication = users
- punched in the samba stuff for firewall
- workgroup is set right

What the heck? I cannot get any client to connect. Not even the server machine can connect to itself through a client. What am I missing here???

Just for the record, I'm trying to connect to \SERVER:



I removed a whole lot of comment lines in the config file.

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OpenSUSE Network :: 11.3 NFS Server - Clients Cannot Connect

Jan 2, 2011

Upgraded two machines to 11.3 in the past 2 weeks. NFS is broken on both, in different ways. The problem I'll mention here is that the nfs server is running, but clients can't connect.

The server is running:
tinderbox:~ # /etc/init.d/nfsserver status
Checking for kernel based NFS server: idmapd running
mounted running
statd running
nfsd running

It has a valid export list:
tinderbox:~ # showmount -e
Export list for tinderbox:

The export exists:
tinderbox:~ # ls -lR /usr/local/share/
total 4
drwxrwxrwx 2 root root 4096 Jan 2 12:10 common

total 0
-rw-r--r-- 1 root root 0 Jan 2 12:10 test.txt

But attempts to mount the export are unsuccessful, both from the local machine:
tinderbox:~ # mount.nfs /mnt -v
mount.nfs: timeout set for Sun Jan 2 12:14:19 2011
mount.nfs: trying text-based options 'addr=,vers=4,clientaddr='
mount.nfs: mount(2): Connection timed out
mount.nfs: Connection timed out

...and from an OpenSUSE 11.0 machine.
moira:~ # mount.nfs /mnt/tmp/ -v
mount.nfs: timeout set for Sun Jan 2 11:52:17 2011
mount.nfs: text-based options: 'addr='
mount.nfs: Unable to connect to, errno 110 (Connection timed out)
mount.nfs: mount to NFS server 'rpcbind' failed: timed out, giving up

I've had NFS running on my local network for over a decade, and never had problems like this before.

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Ubuntu :: No Torrent Clients Will Connect To Any Peers?

Jun 6, 2011

I've used Transmission for about a year now, and i haven't had any problems with it. But a couple of weeks ago it suddenly wouldn't connect to any peers. It gets peer list from tracker, then nothing happens.Ive tried using different clients (Vuze and Deluge) and the same story goes for both. Ive tried restarting the router in case of any DNS crap, getting nothing.Ive installed Firestarter only to create an exception for traffic on the torrent ports (even though it probably is pointless)Now both google and myself seem to be out of ideas. Does anybody have something i could try out and possibly fix this. Everything points to some software issue...

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Ubuntu :: All Ftp Clients Fail To Connect To Any Server?

May 11, 2010

At some point my Ubuntu 9.10 Desktop install has stopped being able to connect via ftp to servers. I have several servers that I have accounts to and I have several ftp clients installed on my system, including gftp, Filezilla, and command line ftp tools. None of them can connect to any of my servers.

Here it is from the command line:

> ftp
ftp: connect: Connection refused

I can connect fine with my netbook running Ubuntu, only my desktop has this problem, and of course I use my desktop for development. Do I have a firewall running or something that's blocking my outgoing requests over port 21?

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Networking :: Clients Can't Connect To PPTP Server

Dec 30, 2010

I'm trying to get a pptp server up and running. The server starts just fine, but encounters errors when a client tries to connect.


CTRL: I wrote 32 bytes to the client.
Dec 29 23:27:48 frankenstein pptpd[9402]: CTRL: Sent packet to client
Dec 29 23:27:48 frankenstein pptpd[9403]: CTRL (PPPD Launcher): program binary = /usr/sbin/pppd


I assume the failed read line is the culprit. I am currently running on a test machine. There is no firewall. I read on this error points to a firewall misconfiguration, but there isn't one.

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Networking :: Vsftpd 2.0.1-6 Auth Tls Clients Not Connect?

Apr 10, 2010

This is as far as FireFTP can go to make a connection.


220 Welcome to Steve Test SFTP service.
Proceed with negotiation.

All the basic vsftpd.conf advice followed:




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Ubuntu Networking :: OpenVPN Server Up And Running But Clients Can't Connect

Sep 28, 2010

I've been the las 4 days setting up my first VPN (OpenVPN bridged). The server is up and running OK but when I try to connect I've got this message in the client log.


TLS Error: TLS key negotiation failed to occur within 60 seconds (check your network connectivity)
TLS Error: TLS handshake failed


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Networking :: Xinetd To Fork New Instances Of Foo So Multiple Clients Can Connect To It

Aug 3, 2010

Suppose I have a server, foo, that runs on port 5555. I can make one connection to it at a time on that port. I want xinetd to fork new instances of foo so multiple clients can connect to it.

Here's a configuration entry:

1) How does xinetd fork a new instance of foo when a previous instance is already listening on port 5555? Wouldn't the new process fail to launch because port 5555 is already in use by the previous process?

2) Suppose five clients connect simultaneously, and xinetd forks five instances of foo. When the clients disconnect, does xinetd leave all five instances running?

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Ubuntu Servers :: Postfix And Prevent Clients To Connect To Port 25 Without Authentication?

Jan 29, 2011

I'm a NOOB setting up Postfix but managed quite well by following the Ubuntu Server guide. I have managed to set it up using SSL but testing a mail client like thunderbird I can also connect to port 25 using no authentication. Connecting using SSL on port 465 by editing "" file works but 25 i still open.

1. How do I prevent clients to connect to port 25 without authentication?
2. I guess I have to have port 25 open in order to receive mail from the outside world?

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General :: Connect Internal Sendmail Server For Roaming Outlook Clients?

Nov 12, 2009

I have CentOS 5 + Sendmail within the local network with Smarthosting settings. How my Laptops users will connect my local Sendmail server for sending / receiving e-mails while out of the office network. I have router but no firewall in place in local network.

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Fedora :: Unable To Connect From Clients Computers To Mail Server For Receiving Mail?

Oct 15, 2009

I have installed F11 on my server bythis article! I have problem with certificatewhen I connectin from clients computers to my mail server for reciving mail! I have warning like this

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Fedora :: Connecting To A Remote XDMCP?

Jun 25, 2009

on Debian/Ubuntu in the login form (i suppose it's "gdm") from the bottom right corner I can pick the option to login to a remote XDMPC desktop (that of course I enabled on the other side..) the network is checked for those open XDMCP service and finally, the login box appears and i can remotely login to a "graphic terminal".

How can I do the same in Fedora? I found some guide about Xnest, Xzephyr, but I was totally unable to find a way for doing this simple task.

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Ubuntu :: XDMCP Without A Graphics Card?

May 13, 2010

I want to run a system that acts as a basic file server, I want to remove the graphics card for the sake of power saving and less heat in the box. My machine can boot without the GPU, and I can ping it and use putty to do things, but I'm still new to Linux and don't really know what I'm doing so GUI is best for me atm.

From somewhere I picked up that this is possible (the XDMCP server machine can have no GPU). This post here [URL].. seems to be what I am looking for, but I don't know how to "convert" these instructions to Ubuntu (the files mentioned do not exist on my install anyway).


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Ubuntu Installation :: How To Get XDMCP Up And Running On 11.04

Jun 20, 2011

I'm on a private network and would like to have XDMCP turned on so different users can access the system with a greeter and log in to their own desktop.To test if this works, I've tried 'Xnest :1 -query localhost' - which on other _nix systems will bring up the greeter, then I know that all I have to do is deal with firewall issues, etc. On Ubuntu 11.04 I just get a blank screen.I've seen others asking for help with XDMCP, and the answers are to use VNC, which from my experience allows you to _share_ the current desktop, not create a new one for a different user to use at the same time. If I am mistaken please let me know.So, any ideas on how to get XDMCP up and running on Ubuntu 11.04?

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OpenSUSE Network :: Window Manageres And Xdmcp

Jun 13, 2010

I heard that window managers like xdm, kdm and gdm etc use xdmcp protocol which is inherently unsafe. Now I have an Xclient that has to be displayed on multiple Xterminals. Can I do this without gdm/xdmcp. Shouldn't the regular X work in this case. What exaclty is the purpose of gdm/xdmcp on top of X. So if gdm provides the complete desktop manager, does this mean it is unsecure since it uses xdmcp?

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OpenSUSE Network :: Xdmcp Is Always Running Even After Reboot?

Jun 17, 2010

I always notice that xdmcp always runs on my system. I don't want it to. These are my settings and I tried to reboot. xdmcp still runs. How do I stop it once for all.



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Fedora :: XDMCP - KDM Connected But Black Screen

Feb 21, 2010

This applies to GDM as well, but I'm using KDM right now so:
Linux #1 SMP x86_64

I setup XDMCP:

/etc/kde/kdm/Xaccess (link to the xdm 'xaccess' file) includes:

In KDM settings I set it to 'no theme' and 'no custom background'. IPTables & SELinux are both off. The client & server are both on the same switch. I can connect successfully. But all I get is a black screen & an X cursor, never get to see the login prompt. Most things I find have to do with the inability to connect at all, but this connects. I'm having this problem on RHEL5.4, CentOS5.4, & Fedora 12. I'm troubleshooting it on Fedora though. I'm not able to even log in.

I must point out that for CentOS5/RHEL5 I got this working, but I didn't do anything differently that I know of. I just repeated the same process over again....but I'm using GDM on those. Is it possible that I may have to use GDM for KDE because it works with GDM? I'd like to get KDM working because that's what it's designed to do right? work the way it's configured. I've not had a chance to look into it with KDM since the time that I posted this thread.

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Server :: Partial Connection To XDMCP With Xming?

May 6, 2011

I had Xming working great with XDMCP on my Debian 6 server at work. I had to replace the UPS and when I brought the machine back up xming/XDMCP no longer worked correctly. When I launch Xming and connect to XDMCP session I get the Xming window, the X Cursor but the GDM login window never appears. So I am getting some level of connectivity. The only change that was made to the server was that OpenVPN service was turned on. I do not know if this is the right log to be looking at but /var/log/gdm3/:0-greeter.log has this in it a number of times:

(polkit-gnome-authentication-agent-1:2252): polkit-gnome-1-WARNING **: Error enumerating temporary authorizations: Remote Exception invoking org.freedesktop.PolicyKit1.Authority.EnumerateTemporaryAuthorizations() on /org/freedesktop/PolicyKit1/Authority at name org.freedesktop.PolicyKit1: org.freedesktop.PolicyKit1.Error.Failed: Cannot determine session the caller is in

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Debian Configuration :: Remote Desktop Attempts Via Xdmcp Or Vnc

Jul 17, 2015

I'm trying to get an laptop running more or less like a headless server, my reasons are not all that serious. Mostly I want to leave the laptop running as a seed box when my main PC is turned off, also want to setup it up as a media top, common place for media files and playback on Tv. So essentially I want to be able to access the remote machine, preferably sharing the same session and persisting while I log out from remote.

What I've done:
setup keys for ssh to connect automatically between machines, so I can login via terminal, access the file system without issues, which is already a great step. enabled remote access on remote machine lightdm manager setup deluge for daemon torrenting, which enables almost seamlessly client to connect remotely (though deluge is not the best with speed)

What I've tried so far:
Connect directly with a new X session
Code: Select allX -query your_server_ip :1

Works alright, creates a new display (:1) which is oddly in F2 tty instead F8 as is expected. Works alright, not much lag, audio is not routed.

But an issue! whenever I decide to log out X will simply shutdown, screen goes black and I can't resume on my regular session on my local machine.Connect X with nested Xephyr session

Code: Select allXephyr -query your_server_ip -screen 1280x1024 :1

This works too and might be the best solution yet, a windows is created and the remote session is nested in your current X session. Visual and performance is ok. Only real issue is that session is not shared, eg, application will not remain running...Connect via VNC

So it seems only solution for shared sessions is VNC.

With the remote desktop apps from KDE (which is the DE for both), I can connect buzz around and etc, but its kinda cumbersome and laggy, password always resets and I usually need to accept on the remote machine.

I've tried setting up lightdm to allow a vncserver at logon, but this is erratic at best, took a long time to get the Xvnc command correct enough for me to login remotely, and even then got a garbled screen and the X session wasn't even the same...

So that's it... Isn't there a way of regular X session sharing in the remote computer? Or a better solution for lightdm vnc invoke?

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Fedora Servers :: Xdmcp Double Login Block?

Jul 22, 2010

How can I manage to avoid double login to a user account in the server by remote users? Is there a way to block it or to hide logged user accounts?

I have two server, one f12, the other f13 (behind a firewalled router) and want them to serve desktops to anybody in the local network. User accounts in both servers are established as username: user1 password: user:1 , username: user2 password: user2 ....... Every remote user should take an available user on server but no multilogin to the same user. Remote users are no adult so they can mistake. That's the problem. On the remote dektop section unmark everyone can see my desktop didnt help.

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OpenSUSE :: Access It Via A Remote XWindow Server Via Xdmcp?

Nov 8, 2010

on a openSUSE-11.3 how do I configure lxde so I can access it via a remote XWindow server via xdmcp?

Entry /etc/sysconfing/displaymanager:
Entry in /etc/sysconfig/windowmanager:


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General :: XDMCP Slow - Looking For Alternative Remote Desktops

Mar 16, 2010

I've been used to using RDP on Windows to remote to machines, and I've got an asus eee 701 which I want to use to do some *nix programming on. While the eee is a lovely little machine the screen and keyboard are a little small to use for lots of programming. I've tried using Xming (the free version) to remote login into the eee from my desktop using XDMCP (or even using a ssh session as a straight X11 server and no desktop on the eee) the whole thing seems seriously slow over wifi the initial desktop takes at least 5 seconds to paint (might even be 10 seconds I haven't actually timed it). So my real question is what do other folks use for remote control with a GUI for their *nix boxes? I am finding it hard to believe the performance is so bad over a wifi network (It makes the Mac IIs I used to use a college in 1988 seem fast) or is this just a problem with Xming and using say the Cygwin X11 server would be better.

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