Ubuntu :: Use Ssh X Forwarding And Gdm Instead Of VNC?
Mar 30, 2011
Using "ssh -X user@server", it's easy to run programs on the server and see their GUI on the client machine. But I want to run the complete gdm on the server so it shows me Gnome login (for example on the vt8; accessible by Ctrl+Alt+F8 ) and when I login, I could work on remote machine while local display is in use via ssh X forwarding. I know that usual solution is to use VNC for remote desktop functionality, but I want ssh X forwarding / gdm combination. Is it possible?
Also I tried "ssh -Xf user@server gdm" and running another X server on my local machine, but it fails sine there is ANOTHER gdm already running on the remote server (of course I do not want to kill it) and I could not find anyway for running two gdm instances on one machine too (at least till now).
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Dec 12, 2009
I have just set up shorewall on my router running Arch Linux. The external network is on eth0 and the internal network on eth1.I have set it up for masquerading and that works fine and I can open ports to the firewall. But I'm having trouble with port forwarding to my internal machines.The problem I have is that when port 22350 is forwarded to 192.168.1.3 on my local network, checking the port with nmap from a remote computer gives me:
Code:
PORT STATE SERVICE
22350/tcp closed unknown
[code]....
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Jan 24, 2010
I am having issues with the DREADED port forwarding. *why* is this important? *why* does it become such a chore to change? trying to run xlink kai on karmic. i have access to the routers in the house. the primary (#1) router is a standard issue Linksys, the other router is my DDWRT router which connects wirelessly to #1.
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Mar 18, 2010
I'm looking to setup X11 forwarding on my machine and secure it either with a vpn or ssh. A portable x11 client is need for access on the go. I am not sure if I am over complicating the issue but security is a must and some app I can run in windows on a thumb drive is a must.
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Oct 28, 2010
i have already changed the sshd_config file but anyone who logs in can access to the internet what should i do?
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Nov 21, 2010
I have a ubuntu 9.10 on my desktop in my office and I have another ubuntu on my home desktop. Both machines are behind a router. I guess many people have already asked the same question: how to remote control the office desktop from my home desktop?Many posts discussed about solving this by setting up ssh and port forwarding. But my situation is that I cannot control the router in my office so I cannot set up any port forwarding for my office desktop. So I guess my question becomes how to remote control my office desktop without setting up any port forwarding on the office router.
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Mar 26, 2011
I currently use a commercial VPN when working overseas for secure internet access.
I now also need to VNC to a home ubuntu desktop (which runs software 24/7 that I need to periodically check).
When overseas, I use a Ubuntu laptop and an Android tablet.
For the VNC I intend to use an SSH tunnel. So my question is: should I ALSO set up openVPN on the home computer (so I can stop paying for a commercial provider which routes all my traffic twice across the Atlantic...) or is it easier/better to use the SSH tunnel for the secure webbrowsing too? Something like a SOCKS proxy?
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May 12, 2011
I followed this guide to forward root's mail.Can it be set up so that mail messages get deleted after being forwarded?
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Jul 13, 2011
I'm trying to set up my mythtv backend on a headless box. The many tutorials out there tell you to run mythtv-setup from a machine with a display by x forwarding through ssh.
Code:
ssh -X username@ipaddress /usr/bin/mythtv-setup
The x forwarding works fine except that the first part of the mythtv-setup requires you to stop the mythtv-backend process which you have to do as root. It brings up a box asking for your password (much like is would if you just typed sudo xxxxxxx in the terminal) but it won't accept the password. Looking in the auth log it seems that it can't authenticate
Code:
Jul 13 11:21:08 server su[21869]: pam_unix(su:auth): authentication failure; logname= uid=1000 euid=0 tty=/dev/pts/1 ruser=administrator rhost= user=root
Jul 13 11:21:10 server su[21869]: pam_authenticate: Authentication failure
[code].....
Now I know that my account (administrator) can have root privileges because I can sudo xxxx to my hearts content via ssh in the terminal, but it seems to not work when it's being requested from a forwarded X window....
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Jan 6, 2010
Pre-exsisting issue from 9.04 server, and has never worked right for me. When I try to open an X11 forwarded app on a mac using the command "ssh -X myusername@serverIP" Other linux machines have similar issues from terminal. I can login just fine and preform any actions I want that do not require X11 forwarding, like say firefox or a manager. I just get the error "Error: no display specified" when trying to do anything with X11 forwarding. I have almost no Linux experience but from tinkering and my friends tinkering wonder if I have a x authority issue.
At one point I had ubuntu desktop package installed (forwarding still did not work then), did a unclean uninstall of it installed Xubuntu. Xubuntu did nothing but throw fits saying I did not have authority to preform all sorts of actions, many relating to root access. This box is meant to be a headless file, print and web server with the ability to login remotely as a convince for administration. I have given up on having a working GUI of any kind on this box. I really do not want to reinstall because of the amount of data on the main partition. What can I start trying to look into?
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Jan 6, 2010
I have Ubuntu 9.10 PC on my home network acting as a VPN gateway. It is using vpnc & iptables to provide access to the remote network - other computers on my local network have routing rules in place to go via the Ubuntu gateway if trying to reach an IP on the remote network. This works just fine, except DNS lookups for names on the remote network don't work.
I'm trying to solve this by using Bind9 on the gateway, so it can act as DNS for the local network. I don't want to create excess VPN traffic or load on the remote DNS, so I want the gateway to forward the lookup to my ISPs DNS first and if the name is not found then try the remote network DNS. Is this possible, or is there another (better) way around this? The Bind9 configs seem to admit multiple DNSs, but use them in a failover sense - only using secondary DNSs when the first one in the list is not reachable at all.
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Jan 15, 2010
is it possible to stream a window from X, as opposed to forwarding it over SSH? I've used X-forwarding before so that I could ssh into another computer and open up a graphical program and have it show up on mine. But as far as I know, that window only opens on your computer, not on the computer the program is actually running on. Is it possible for me to open a window on my computer, and to sort of X stream it to another computer that has X so they can watch what I'm doing in that window?
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Jan 31, 2010
I have a script to establish a reverse tunnel with other machine,My problem is to stop the tunnel. If I just kill the PID at sshtunnel.pids, ssh does not release the ports at the server side, so any new connection will fail for several minutes.Is there any way to signal SSH to exit gracefully?
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Feb 4, 2010
Up to now I've been playing with Ubuntu whilst storing important data elsewhere for about 2 years. Now I'm ready to move to Ubuntu completely but want to address my security.I'm currently using a desktop and server behind a hardware firewall / Internet router. The router has DynDNS and forwards port 80 to the webserver and a port I picked at random to the desktop 22 for SSH with private keys. SSH passwords are disabled.
The first question is, is there a danger of running different security levels on the two machines? I don't care about the server, there is no data on it so I currently forward port 80 and am considering forwarding ports 631 (CUPS) and a port for LDAP. Will this effect my desktop (which has info I don't want to loose).The next question is whether port forwarding / hardware firewall is actually a safeguard against attack.
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Feb 20, 2010
This should be easy but for some reason its not working. I don't have admin rights on one of my local networks to open the firewall for port 80 to make my server accessible remotely (from the internet). I have a remote server (OpenVZ VPS) and I want to port forward so that [url]:8080 will point to my localhost:80 from the internet itself (i can get it to work on the remote VPS server's local network)...
How could I accomplish this? Basically, I am trying to serve webpages from behind a firewall using a VPS as a hub.
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Apr 30, 2010
At work we are planning on migrating XP machines to ubuntu, and from there connect via remote desktop to a Windows Server 2008. That part is working perfectly, but our problem now is how to set up ubuntu to "share" the local webcam, so it can be used from the remote session in the server. Going through rdesktop man page there is a redirection option, but doesn't say anything about USB devices.
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May 6, 2010
would it be possible for anyone to give me step-by-step instructions on how to set up port forwarding on my laptop? I've been using Karmic Koala and just upgraded to Lucid Lynx and not really bothered to port-forward before, so not too sure where to start - googling gives me a lot of terms I don't understand.
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May 13, 2010
I'm trying to SSH into my home computer from a remote location outside of my house's LAN and can't figure out remote port fowarding.
The guide here says to use the following:
Code:
I've tried connecting to my home computer through many combinations of the syntax listed above, read the man file, and looked online for help. But can't find out the proper syntax or a good guide that isn't written for Windows users using Putty.
Let's assume for the sake of simplicity that the public IP address of my home SSH server is 123.123.123.123, the private IP address of my home SSH server is 192.168.1.100, my home SSH port is 2222, and the SSH port at my current location is is 22. How would I write out the command?
Every time I try to connect I get a "connection times out" error.
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May 22, 2010
I have set up 10.04 server, got userdir working (/home/username/public_html) so I can access it with h ttp://myipaddress/~username. What do I need to do to get mydomain.com to point to http://myipaddress/~username?
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Jul 6, 2010
I have two nic cards installed in a Lucid LTS server.
eth0 is static using
address 192.168.0.235
gateway 192.168.0.1
netmask 255.255.255.0
[Code]...
I have my Qwest DSL modem port forwarding port 80 to 192.168.3.235 however this doesn't seem to work if I have both cards running. If I remove the second card (eth1) and reconfigure eth0 to use 192.168.3.235 I can port forward into my webserver.
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Aug 22, 2010
I have logged into my router and set up port-forwarding on port 22. I can log into the machine fine from a machine on the local network using the machines internal IP but when I try to log on from a remote machine using my router's external IP or my DyDNS host-name I get a message saying "connection refused" or "connection timed out." I have configured port-forwarding on the router and the firewall rules says that port 22 is open but when I nmap my routers external ip it says that only port 23 and 80 are open. I am very new to linux and networking.
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Sep 9, 2010
I have Postfix set up to forward e-mails to two different addresses. This is my /etc/postfix/virtual:
Code:
I'm forwarding the message back to myself because that's the only way I know if the original message is even getting delivered in the first place.
The problem is that the e-mail isn't making it into my GMail inbox. I've checked my spam folder and it isn't there. And bafflingly, according to the logs, the message does seem to be getting sent:
Code:
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Nov 2, 2010
I've used wake on lan and SSH on the local network for some time now. I also used SSH to mount a filesystem (SSHFS / sftp, same thing, right?) and I could forward X11, loved it. I used both these options for my convenience. So I decided it was time to open up some ports on my router (Linksys WRT320n running dd-wrt) and try to set up a remote connection. This actually worked after some time, so I'm now able to turn on my home computer from the Internet (school in my case) and then log in to it through SSH. I set this up using other ports then the default ports. Something like this (these are not the actual ports I use, just examples):
port 2112 -> port 9 (for wol, wake on lan)
port 2113 -> port 22 (for SSH)
This information might be useful: I set this up using public and private keys. This is necessary for SSHFS to work properly I think and it also makes it more secure. And then I found (and had some presumptions that this was going to happen) that both SSHFS and X11 were not working. I'd rather not open up more ports on the router for security's sake though, so I'm asking for other solutions. And if there really aren't any other solutions then which ports to forward. And if forwarding is really necessarily then how to make the client use port 2114 for SSHFS and 2115 for X11 so I can forward those ports to the default ports.
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Dec 13, 2010
We have a Ubuntu system that is connected to 4 different networks.
Code:
eth0: 192.168.12.9
eth1: 192.168.2.142
[code]....
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Dec 20, 2010
Got Ubuntu Server 10.10 installed as a virtual machine (vmware). When i forward X through SSH (putty) i can start xeyes, xcalc,etc.
Now when i disable ipv6 putty can't set the display variable and i get "Error: can't open display". I haven't changed anything in putty or win 7 (the host system).
I disable ipv6 by putting these lines in /etc/sysctl.conf
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
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Jan 30, 2011
I'm trying to set up very simple UDP port forwarding, but can't seem to have good results. I read trough netcat and iptables manuals, but can't seem to figure things out. my setup is the following:
I have machine1, listening on UDP port 49000. I have machine_fw, which accepts connections on 59000, and forwards all this to machine1:49000 (and returning traffic too) I have machine2, which will connect to machine_fw:59000, and this way communicate at the end with machine1:49000, as machine_fw is taking care of forwarding is there an easy way to achieve this?
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Feb 1, 2011
At home, I am running Ubuntu 10.04.1 LTS with openssh server OpenSSH_5.3p1 Debian-3ubuntu5 In my office, we are using CentOS 5.5 with openssh OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 Both my /etc/ssh/sshd_config at home and my ~/.ssh/config has X forwarding enabled.When I log in to my home machine from my office with ssh -X -vv host, I got the following:
Code:
debug2: x11_get_proto: /usr/bin/xauth list :0.0 2>/dev/null
debug1: Requesting X11 forwarding with authentication spoofing.
debug2: channel 0: request x11-req confirm 0
But once I log in, I get:
Code:
home:~>echo $DISPLAY
DISPLAY: Undefined variable.
I tried setting DISPLAY to localhostx.0 (xx from 0 to 10) but none of that works. I have also tried ssh -Y but the result is the same.
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Jun 13, 2011
I just bought a domain, let's say it's called example.com
I also have a gmail account, let's say it's: my.account@gmail.com
I want all email to master@example.com to forward to my.account@gmail.com, and likewise I want all e-mail from my.account@gmail.com to be from master@example.com, and have the reply-to also be master@example.com.
I guess the most pressing issue here is setting up some proxy to forward all my @example.com emails to my gmail. I've been looking through the forums and reading some tutorials, but none of them seem to do exactly what I'm looking for.
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Jun 23, 2011
At first I want say that I'm regular Ubuntu user, not system administrator. I have installed mail server using Virtual Users And Domains With Postfix, Courier, MySQL And SquirrelMail (Ubuntu 11.04). And it's work!
But I have a challenge. I need to get incoming mail (from another server), zipping mail-body (as html or text) and all attachments into zip-archive, compile new mail with this new attachment (zip-archive) and (most important!) sign all this email with signature which locale in pem-file and send it to BCC-address from incoming mail. I don't know how do it or which tutorial start to read.
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Jul 28, 2011
I don't understand the concept of ssh port forwarding and tunneling.I was going to set up a remote desktop (vnc) connection to my grandmother's laptop that we'll give her soon so if something goes wrong i can fix it from here (she lives on the other side of the world). However, i've read using vnc plain over the internet isn't secure, and that i can secure it by running it through an ssh tunnel.That's what i've understood so far. However, from there on i get confused.
I'd have to run both an ssh server AND a vnc server on her laptop? So what i'd have to do is ssh into her computer, and then while logged on on her computer, somehow open a vnc connection back from the remote server to the local computer? Then i'd go back to my local computer and open a port where the vnc connection is waiting? From the concept, it would seem like i should be able to tunnel all the regular network traffic from the local computer to the remote one through ssh?
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