Ubuntu Networking :: Tunnel Device Open Failed?
Jan 18, 2010
I run Ubuntu 9.10 locally connecting to CentOS5 on a remote server.When I run the following command in the Terminal;ssh -v -L 10005:localhost:10000 root@remote_ip_address -F ~/.ssh_config -i ~/.ssh/private_key_file_nameafter 'Authentication succeeded (publickey)' I get the following for channel 1;sys_tun_open: failed to open tunnel control interface:Permission deniedhowever, it does open an interactive client-session on channel 2 and my browser will then connect (via URL localhost:10005) to Webmin on the remote server which is the object of the exercise.However, because sys_tun_open failed, I am concerned that the transactions may not be encrypted as I understand they would be in proper tunnelling
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May 24, 2009
I'm getting these messages Over SSH with the -D switch
Code:
At uni I did this for a couple of reasons, primarily to connect to trackers for bittorrent. I would get these messages fairly often but I never thought much of it because I figured I was just loosing packets over the network or something (understandable in my situation). At home I decided to continue to use this method because that computer is set up in DMZ and is very useful. I havn't received many of these messages but recently all my torrents stalled and I had a whole bunch of these messages. Is it possible my computer just cant handle all the network connections (it's a 2ghz AMD running debian)? What exactly do these messages mean? Is there any way to optimize my connection in any way?
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Jan 21, 2011
I'm trying for the first time to work with sounds and edit them. I'm trying to use Gnome Wave Cleaner and don't know what to do about the error.
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Jan 8, 2010
My scanner is Benq 5000 ,the default scanning software (xsane) give me the following message whenever I plug the scanner to the pc :
Failed to Open Device 'Snapscan:libusb:005:002' Invalid Argument.
I tried the gnome image scanning software too but it didn't recognize the scanner at all. The only software that worked is vuescan but unfortunately it is non-free software !!!!
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Jan 16, 2010
I have been working on this for a while now and am absolutely stumped. Basically, what i am attempting to do is make my ubuntu box into a gateway for my network. I have everything working thru hard wire, but I simply cant get the wireless to work. No matter what I do, I cannot get my wireless card to transmit an essid and allow nodes to connect. I have tried assigning it in the interfaces file (shown below), and I have also tried manually modifying it using the iwconfig command. Here is the topology:
eth1: internet WAN
eth2: ethernet out to LAN
ra0: wireless out to LAN
Here is a copy of my /etc/network/interfaces file:
[CODE]
auto lo
[Code]...
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Aug 10, 2010
Yesterday I did an upgrade and today my box is unable to connect to the internet.
I have tried another cable, it didn't help.
Basically NetworkManager does not connect eth0 to the network, if I try to run ifup from the command line I get:
Code:
I can see in network configuration settings, that the device has been correctly detected and eth0 interface is correctly activated, yet when I try to uncheck the box manage by NetworkManager and start it manually, it tells me that the cable is disconnected... I've tried two different cables, different ports on my router - no help.
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Jun 20, 2009
I am running lmgrd on CentOS5, but it returns Failed to open the TCP port number in the license. The port is 27000, how can I open that port?
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Apr 13, 2010
All my music editing software programs say, "unable to open device /dev/dsp.Device or resource busy." How can I fix this?
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Jun 11, 2011
I rebooted my server and out of nowhere the RAID5 array won't assemble. I've tried everything I could think of to reassemble the thing. I fear that the array is ruined, but I can't imagine how. Here are various bits of information: The simplest failure (with and without partition numbers, which have not been needed in the past):
Code:
richard@nas:~$ sudo mdadm --assemble --verbose /dev/md0 /dev/sd[bcd]
mdadm: looking for devices for /dev/md0
mdadm: cannot open device /dev/sdb: Device or resource busy
[code]...
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Sep 10, 2009
I've read hundreds of threads on this problem but they seem to be intermittent and the resolution has been using a different kernel version.
I'm using the latest kernel but I still have this problem
Running Logical Volume Manager gui and attempting to extend the volume results in the same error.
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Jan 7, 2010
I just added a 2 port network card to a system that is running Fedora 11, but it is INACTIVE. I open the Network Device Control to activate it but there is no network ports in Network Device Control. It is empty.It looks like the system recognize the card and loaded correct driver.
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Nov 15, 2009
I have a desktop that has a d-link DWL-520 wireless card, which was working under Windoze. Today I installed Centos 5.4 on the system , which went cleanly. I then used Network Configuration to set up the wireless card. I specified to use DHCP, set the SSID and authentication password. When I tried to activate the card I get these error messages
Error for wireless request "Set Mode" (8B06): SET failed on device wlan0 ; Operation not supported. Error for wireless request "Set Encode" (8B2A): SET failed on device wlan0 ; Invalid argument. Error for wireless request "Set Encode" (8B2A): SET failed on device wlan0 ; Invalid argument. Determining IP information for wlan0.
The hardware manager seems to have correctly identified the card and chipset, (Intersil Prism 2.5) and installed driver hostap_pci which came with the distro. This web site seems to suggest that this is the correct driver: [URL] searching forums I've found a few references to these errors, but they were from several years ago, and for different distros and cards. I did find a reference to using Network Manager to configure the card instead of Network Configuration. I started the NM service and configured a connection using it instead, but still no luck.
[Code]....
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Oct 3, 2010
I Need to make an SSL tunnel over SSH, I need to create exactly an SSL tunnel,I have a situation like that, I heared it is possible,but don't know how to create an SSL tunnel over SSH i am having putty installed on my pc,So i think i can use putty for this purpose, But i don't know how to do this.
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Aug 3, 2011
I wanted to create an ssh tunnel but I do not know what commands to run .. my environment is as follows:
LAN Internet Office LAN
Home PC <-> Linux firewall <-> http server..
According to the above what I figure is that I have an internal web server at my job and I need to create a tunnel to access the web server from my PC in my home. I know I can do a port forwarding with the firewall but I don't want to publish this web server to Internet. My home PC and both servers (firewall and web) are ubuntu. My idea is create a ssh tunnel that forward port 8080 on localhost in my home pc, to the firewall (obviously with public ip), and the the firewall forward to port 80 on office web server at my job. Note that the firewall accepts ssh connections to port 22, same for web server...
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Jan 31, 2010
so i start it with ssh -f -R 4096:localhost:22 me@server.com and it comes up and someone can log in at the remote end. how do i close the tunnel from the initiating end ? netstat doesnt seem to identify my end of the tunnel , unless im looking for the wrong thing!
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Jan 31, 2010
Browsing via SSH Tunnel very slow When browsing in firefox at work via proxy through ssh on my 8.04 server the speed is near dial up. I have compression enabled, tried restarting ssh, and rebooting the server but it remains so sluggish. At home the connection is quick but the speed is lost in translation once I ssh in. I also tried adding "UseDNS no" to the ssh config but that did not help with the slow login or any other speed issues.
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Mar 29, 2010
I tried this :
Quote:
ssh -ND 9999 username@home_router_ip_address
and this is output :
�nani@jebe-kevu-ovaj-PC:~$ ssh -ND 999 nani@nani.homelinux.com
Privileged ports can only be forwarded by root.
nani@jebe-kevu-ovaj-PC:~$ sudo ssh -ND 999 nani@nani.homelinux.com
[code]....
which password is he looking for exacly ? user nani is main user at ubuntu after he asked me for password i typed my nani user password and i got in , after how you can see he ask me for onather password i tried the nani�s password but nothing is heppening ?
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Sep 17, 2010
I'm trying to run a script to execute the command
Code:
ssh -D port host
when my laptop connects to internet. I have placed the script in /etc/network/if-up.d/.The scripts is being run when it should, but the SSH-tunnel isn't created.I can however run the script manually, as root, and then the tunnel is created.
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Nov 13, 2010
I have a server running Ubuntu Server 10.04 that is a VirtualBox/Samba/SSH server. I have port forwarding set up for ports 22 and 3389 (SSH and RDP) and I want to access the Samba share without opening any other ports. I can connect to it from my internal network, but I want to be able to access it from school. My best guess would be to tunnel the Samba port through SSH, but I don't know how. I will be connecting to it from Ubuntu 10.10 Desktop.
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Feb 14, 2011
In the office I use firefox for my work items and chrome for my personal items. I currently use proxy switchy with chrome to browse through an ssh tunnel to my home server. The chrome/switchy part works fine.In order to do this I have to open a command window every morning and execute:ssh -p8181 -D 9999 user@myhomeserver.comThen the command window asks my password and I am up and running. (my ssh server at home is running on port 8181)Is there a way to script this so I don't have to open the command window and enter my password every day (and also to prevent a visible command window from being open and visible)
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Jul 6, 2011
I set up a routed OpenVPN server. Everything works fine. But I'd like to route the DNS queries thru the tunnel too. So I added:
[Code]....
Can't find server name for address 10.8.0.1: Non-existent domain Even thou I have a DNS server set up correctly (on the same server as the VPN) with recursion. I verified that by sending queries form external source, which worked fine. I suspect that the Bind server doesn't listen to the tun0-interface only eth0, but the Bind manual says it should listen to all interfaces by default. The server log shows:
Code:
named[9639]: client 10.8.0.10#3807: RFC 1918 response from Internet for 1.0.8.10.in-addr.arpa
How do I get these DNS queries to resolve thru the tunnel?
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Jul 19, 2011
I use two Ubuntu machines, one at home and one at work. In order to connect to the machine at work from home I need to connect through a "tunnel server" that controls all the traffic to the machines at work.I am able to connect with ssh to the tunnel server and from the tunnel server ssh my own machine at work. My question is how do I retrieve files form my work machine to the home machine. How do I sync folders between the machines using rsync when the "tunnel server" is in between?
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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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Oct 3, 2010
I am currently running 64-bit Windows 7 from my home laptop and I would like to establish an SSH reverse tunnel to my laptop from my work Ubuntu 64-bit machine. I have been reading many "tutorials" that have led me nowhere and I feel as though I'm chasing my tail now. I have done the following on my Ubuntu machine:
Code:
ssh -R 19999:localhost:22 laptop_ip
and on my Windows machine, using putty, did the following:
Code:
Host Name: host_IP
[Code]...
I am able to access my Ubuntu machine when on my work network but there I have been unsuccessful when it comes to trying to remotely access it. I have tried everything that I can think of (though I am a novice). If there is any help/suggestions/ideas that could help, please let me know and don't hesitate to ask for more info!
p.s. I would also like to enable x-forwarding, but for now I would like to have remote access to the Ubuntu machine.
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Jul 20, 2010
I'm trying to create a VPN through SSH but encounter the following:
Code:
[18:42:11]root@bronzhip:/home/casey# sudo ssh -w 0:0 97.**.***.221 -i VPN
channel 0: open failed: administratively prohibited: open failed
[code]....
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Mar 24, 2011
I'm trying to set up a secure web tunnel at home I have an Ubuntu box (desktop), a Mac, and a Windows 7 box. I use all of them for different reasons. I want to be able to route traffic from my browser through my Ubuntu box. I have done this before with proxy servers abroad, but I want to do it using ssh and my box at home so I don't have to pay for a service i.e (Secure Tunnel)etc.
I followed the instructions at http://bit.ly/hAnp6u. However, using my Win7 box, after I set the browser part per the instructions, I get no connection from the browser.
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Oct 21, 2010
Is it possible to chain together multiple SSH tunnel hops in a single `ssh -L` command on the client side? I have two gateways I need to get through in order to access a remote host. For a normal SSH client connection, it's simple enough chain this all together by simply appending the additional SSH connection commands to the first one:Code: ssh gateway.1 ssh gateway.2 ssh remote.host.
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Nov 28, 2010
I'm trying to create EoIP interface on ubuntu so i can create a simple tunnel to my mikrotik router. Is there anyone know how or even done that? If EoIP is not possible, is there any other simple way?
I had already read and thought about doing it with OpenVPN, but when I read the community documentation for OpenVPN on ubuntu 10.10, I fear it won't connect the tunnel to mikrotik OpenVPN server, since OpenVPN on ubuntu uses 2 certificate and 2 key files(as i read on the docs), but mikrotik configuration, i can see only 1 certificate can be applied on. This confuses me and make me decide to use EoIP(but i can't find any tutorial/docs about it). I don't actually need the encryption and security, i just need to create a tunnel for ubuntu and mikrotik.
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Nov 30, 2010
My friend has a server with 2 ips, 1 primary and 1 secondary/failover. He has given me a shell account and I want to use ssh to route my home http traffic through it like a socks proxy. I connect to his server using the secondary ip like this:
ssh me@secondary_ip -p port -D forwarding_port
It builds a proxy, however it uses the primary ip of the server, not the secondary ip that I logged in with. When using irssi I've bound it to the secondary ip with no problem. If I try to use the -b flag I get the error: cannot bind: Cannot assign requested address.
how I can bind the ssh tunnel to the secondary ip?
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Feb 4, 2011
I am using 10.04 ubuntu and I have forgotten my password to login to a ssh tunnel. It is not the root password on my computer. Is there any way I can find the password out, change it, or just start over and create a new one? I know it isn't a connection problem because I can't login to ssh from localhost either. I've tried reinstalling ssh too.
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