Security :: SSH Tunnel Not Accessible From Different Machine On Same Network

Dec 16, 2010

I have an SSH tunnel setup between a local server and a remote postfix relay VPS. This is so we can route all our outgoing mail through this SSH tunnel to a private relay VPS, this seems to give us much more consistent mail delivery than using our ISP's relay. So the SSH tunnel is set to route port 1025 on machine A to port 25 on the VPS This part of it is working perfectly and has been for months. However today I wanted to set our e-mail newsletter software (on the same network as the SSH tunnel start-point) to send through the SSH tunnel. So I punched in the IP/port... 192.168.1.5:1025 but it doesn't work. Is there something I need to do to allow connections from other machines on the LAN to access the start-point of the SSH tunnel? Or are SSH tunnels restricted to localhost connections only?

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General :: Get Virtual Machine (virtualbox) Accessible On Company Network?

Jul 11, 2011

I created an archlinux vm guest using virtualbox on my windows desktop at work. I'm planning to use it for django development because there are no unix machines available to use as a workstation at work.

From the vm guest I can ping/ssh to other machines in the network, but not the other way around. It's like even though the guest machine has an ip address on the network and a hostname, neither is recognizable.

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Ubuntu Networking :: Setup A Ssh Tunnel From Machine A To Machine B?

May 29, 2010

I can set-up an ssh tunnel from machine A to Machine B:-

fred@my-linux:~$ ssh -P myport fred@myserver.homelinux.com

I can successfully logon to machine A to Machine B.

what address and port will my tunnel 'appear' on machine B? I want to send a stream back from B to A up the encrypted tunnel, not over the open network.

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Ubuntu Networking :: After Upgrade, Machine Accessible By Ip, Not Host Name?

May 14, 2010

I have just upgraded to 10.04 (not ideal I know, thought I would give it a go). Now the machine is only accessible via its IP, not host name. I reinstalled Samba, but still not working

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Fedora Networking :: File Storage On F10 Machine Accessible By XP Computer

Mar 5, 2009

I want to have my Fedora 10 computer act as file storage and access it from my Windows computers.
Details:
Fedora 10 box is fully functional and connects to the internet using a wireless card to my Linksys 54G router. I've configured the smb.conf file to workgroup MSHOME, and assigned it an IP of 192.168.1.150. I've also set it to turn on smb at boot. Windows XP Home is hard wired to the same router with the standard Workgroup of MSHOME. Windows is set to obtain IP and DNS automatically. There's another Windows XP Home system that's also wireless on MSHOME that I can interact with fine from the main Windows comp. Ping results to 192.168.1.150 results in Request timed out.

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General :: Make Some Files On Machine Accessible Via HTTP Using Apache?

Mar 6, 2011

I did a wget on the source and built the apache binaries correctly. Now what do I need to do to get some documents accessible using HTTP (start some services?)? Also, do I need to group all the files I want to make accessible in some directory and make the directory and its contents accessible or can I just make the individual documents available? I will be providing these links to my colleagues and do not want them to be down, so need to make sure that the apache services are up automatically after a reboot. Does apache have some inbuilt support for this?

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Ubuntu Networking :: Local Machine Is Not Accessible From Out Side World

Jul 30, 2010

I m using the pc as gateway....i have two NICs:1) 10.6.15.254 ---> for internal network 10.6.15.02) 10.6.0.115 -----> for out side world I can ping and ssh any out side machine but when i try to ping or ssh any machine in the 10.6.15.0 network it says host unreachable.... i can ping and ssh gateway i.e. 10.6.15.254 and 10.6.0.115 but not the client machine in the 10.6.15.0 network from out side world even i flush iptable rules i can not access any client machine i m using ubuntu 10.04 as operating system..

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CentOS 5 Networking :: Samba Share Not Accessible From Windows Machine?

Feb 13, 2010

I have Linux installed on one machine with samba running and a second machine running XP. They are going through my router and I am using the same username/passwords for both machines and I have even gone to the point of allowing access to everyone for the share I created and the worgroup in samba is MSHOME just like my XP machine. When I view (or search) my workgroup computers my Linux machine shows up and so do the shares I created but when I try to open them I just get a message that permission is denied and I may not have permission to use this resource. I even tried setting access to the shared folder to 777 but still I can't open this share. Has anyone got any idea of why this is?

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CentOS 5 Networking :: Setup A Network To Network VPN Tunnel Between Our Main Office And A Temporary Location?

Aug 12, 2009

I am attempting to setup a network to network VPN tunnel between our main office and a temporary location. This location need full VPN access back to the main office's network.Anyhow we have spent about 3 solid days attempting to make this work without any great success. Here is our network scheme for these two devices.

Network A (Main Office) (OpenBSD using isakmpd)
Network: 172.16.8.0/24
External IP: 1.1.1.1 (obviously not the real IP)[code].....

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Fedora :: Directory On User Account Which Is Visible And Accessible To Other Users On The *same Machine*??

May 11, 2011

This is a simple question which hopefully has a simple answer. How do I set up a directory on my user account which is visible and accessible to other users on the *same machine*? For example I have certain files on my account which, if I want another user to be able to access I'd have to (a) copy them to my thumb drive (b) log out, (c) log in to the other account, (d) copy the files from the usb thumb drive

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Ubuntu :: Setting Up A Cron Job Creates A Tunnel To Remote Machine To Work Correctly On 9.10?

Jan 12, 2010

I am having some trouble setting up a cron job that creates a tunnel to my remote machine to work correctly on Ubuntu 9.10. The setup looks like the following:

(1) myscript.sh (executable)
Code:
#!/bin/bash
ssh -2 -x -i /home/user/.ssh/id_rsa.prv -L 3128:myremotemachine:3128 myaccount@myremotemachine
(2) crontab -e, added the following lines:

[Code]...

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Ubuntu Security :: Allow SSH Tunnel Through Ufw Firewall?

Jun 15, 2011

I have set up a Ubuntu 10.10 server. I have been using ssh tunnels to encrypt my web traffic at public wifi. I am trying to make this server as secure as posible so I enabled ufw. I allowed SSH and HTTP traffic in and denied everything else. But when I do that I can not use SSH -D because when I try to visit a webpage it does not load and I get the following.

Code:
uname@mybox:~$ channel 3: open failed: connect failed: Connection timed out
^C
uname@mybox:~$ fclchannel 4: open failed: connect failed: Connection timed out
^C
uname@mybox:~$ exit
logout

What do I have to do to allow ufw to allow ssh tunnels through?

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Security :: How To Set Iptables For IPSec Tunnel?

Jan 7, 2010

I want to setup firewall protection with iptables to support IPSec tunnels. That is, the firewall will drop anything from any host if it is not from an established IPSec tunnel. And it will accept anything (any protocols) if it's from an IPSec tunnel.

That is, I need also to open up ping to make ping work. But if I open up icmp, I cannot prevent pings from hosts that's outside my IPSec tunnels. This defeats my purpose.So if my purpose is to allow "anything" within the tunnel and disallow/drop anything outside the IPSec tunnels, how should I setup the iptables rules?

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Security :: Encrypt Folder So It's Accessible To Cron?

Jan 5, 2011

I have a script that crond runs each night. The script pulls some sensitive files from an SFTP server and stores them in a folder on the local machine.I need to encrypt those files on the filesystem. Ideally, I could encrypt the folder they're stored in to require a password whenever the files are accessed. The problem is that then crond wouldn't be able to access the files. Using something like ecryptfs would allow the cron script to mount the encrypted storage by supplying the password, but now the keys to the kingdom are just sitting in a cron shell script.

Is there a good way to approach this? One thought I had was finding a tool that lets cron encrypt the files using a public key, then require a password to decrypt them (silently using the password to access the related private key)I don't want too much complexity on the decryption side, because I will have relatively non-tech people needing to access those files occasionally.

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Fedora Security :: Sshd Reverse The Tunnel Info?

Feb 18, 2011

I have an sshd server up and running (F13 64bit) I'd like to connect to a pc that's behind a firewall using ssh tunnelling, so I have something like

ssh -R 1234:127.0.0.1:22 myuser@mypc

then from mypc I can succesfully login to the remote pc. I have just une question. How can I list the ssh active connections and the forwarded ports ?

I've only got to

netstat -tunva

but this returns only (filtered)

tcp 0 0 127.0.0.1:1234 0.0.0.0:* LISTEN
tcp 0 0 ::ffff:172.16.0.XXX:22 ::ffff:172.16.1.XXX:60744 ESTABLISHED

Now I know that the first is the tunnel end but how can I connect the two lines if I don't know the port number (ie: someone else estabilieshes another tunnel)

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Ubuntu Security :: Https Doesn't Work With Ssh Tunnel?

May 12, 2010

I have an ssh tunnel with my ubuntu (vps) server. On my local computer I have proxifier, to redirect everything with socks5.

Everything works fine, I can browse websites and that. Email also works.

But when I want to visit a website that uses https it doesn't work. I do not get to see the website, or receive an internal server error.

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Ubuntu Security :: Setting Up A Public Ally Accessible Computer?

Jan 13, 2011

Our local community wants to provide broadband access for people who don't own a computer. I have been given the task of setting this up and I am going to use Ubuntu. Internet access will be via a usb dongle to a T-Mobile 3.5g network. Initially we are intending to limit access to just Internet browsing. Most users will probably be older people, rather than teenage hackers. configuring/securing a default Ubuntu install for this sort of use.

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Ubuntu :: Make Computer Accessible Without Opening Gaping Security Hole?

Mar 4, 2010

my son is 15, autistic and mentally retarded. he is moderate-low functioning and loves to watch barney the dinosaur, thomas the tank engine and other young children's programming on videos on his computer. he can talk in a limited way and can read out loud at about the first-grade level, though he seems to have little or no comprehension of what he's read (hyperlexia).i'm having problems with viruses and spyware because he lacks the judgment that keeps the rest of us from clicking on every window that pops up. we've had a particularly nasty crop of ad-ware viruses lately that pops up graphic porn ads even when the browser is closed. i've had enough of this.

the computer is an ancient dell dimension 4600 desktop (circa ~2002) running windows xp. i've run ubuntu from a live cd and installed flash as a test. videos videos play fine, so that's not a problem. i don't really want to replace the computer becasue it still works and is only used by him to run firefox. i am willing to buy a new computer if that turns out to be the only option.i've been using ubuntu exclusively on my laptop for several years and i would like to remove windows from his computer and replace it with ubuntu. i'm wondering how i can make his computer as accessible as possible to him while not sacrificing too much security.my son has very poor fine motor control over his hands. he can use a mouse with some difficulty, but using a keyboard is out of the question. he can use the mouse to click on the shortcuts to his favorite videos, but i can't think of how he would be able to enter a password for his account. not only does he have the fine motor problem, but he is not able to remember any usefully secure password.

does anyone have any ideas about how to make his computer accessible to him without opening a gaping security hole? two ideas that i've kicked around are creating a user with absolutely the minimum privileges required to use firefox and no password or finding some way to enter a password that doesn't require a keyboard. i haven't come up with how to implement either of those ideas successfully.

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Security :: Centrally Control Several Ubuntu Machines / Each Machine Should Get Permit From Central Machine Before Installing Any Software?

Jul 31, 2010

I have several (say, 50) machines running ubuntu.I want them to be centrally controlled.That is, each machine should get permit from central machine before installing any software etc.I googled quite a lot but could not find the solution...

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Fedora Servers :: Samba On 15 - Network Is Not Accessible

Jul 26, 2011

I have been trying to set up a small file server on Fedora 15 using Samba. When I try to connect from WindowsXP it says the network is not accessible. I have tried to make multiple changes to the settings but to no avail.

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OpenSUSE Network :: XP Pro Share Not Accessible In Explorer

Jun 10, 2010

I have a share accessible from XP. However if I go for lunch and come back when I click on the share in Explorer it says its not accessible. When I click on it again it works. Its like the network card in the Suse server is going to sleep but I cant see any settings for it. I know where they are in XP and wonder if they are somewhere in openSuse? Or if there is some other explanation.

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OpenSUSE Network :: Samba Share Only Accessible Via IP?

Oct 19, 2010

have a server here running opensuse 11.3 that I need to access via network using samba.
Samba is working so far and I can ping the serve and browse the shares from windows (WinXP) computers; but only via the IP.Now I've read up on samba on this forum and other sources, like the official samba documentation and compared my smb.conf with an older one on another server which works (and even copied this one over to the new one) - to no avail.I seem to be missing something and I just can't find it.Since the problem is probably not in the smb.conf (previously working one doesn't work on new server) - where else could I have screwed up?

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Networking :: Get A Subdomain Accessible Outside The Local Network?

Jul 25, 2011

I have a subdomain called www3 and I cant see it outside of our network. It's added in vhosts.conf in /etc/httpd/conf.d, and I can access it through [URL], but only when on vpn.

We have another www2 that is both local AND outside the vpn. I am testing the site live and need access to it. Is there another file besides vhosts.conf that I need to add the ssubdomain in? Here's what I added in my vhosts.conf

Code:

<VirtualHost *:80>
ServerName www2.mydomain.com
ServerAlias www2.internal www2

[code]....

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General :: Network Computer Is No Longer Accessible?

Dec 13, 2010

When i first install ubuntu 10.10 the other day my entire windows shared network was visible and accessible through places/network ect.i only had an issue creating a link.Now , for some reason i can no longer see the other windows comp or any of its folders but i can see my sons laptop ( running vista) . obviously i still have access to the network and i have checked the sharing settings on the windows machine.

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OpenSUSE Network :: Configuration Of 6to4 Tunnel On Ubuntu

May 6, 2011

I've got problem with configuration of 6to4 tunnel. I do it like they do here using iproute2 HTML Code: [URL] And still I can't ping ipv6.google.com: I' ve got Destination unreachable: Address unreachable

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Ubuntu Networking :: Network Computers Not Accessible By Host-name

Aug 16, 2010

For some reason, all the computers on my network can't reach each other via their host names. For example, the ping command doesn't recognize host names:

Code:

$ ping file-server
PING file-server (208.68.139.89) 56(84) bytes of data.
^C
--- file-server ping statistics ---

20 packets transmitted, 0 received, 100% packet loss, time 19152ms However, ping works fine if I use IP addresses instead. I would put the address for "file-server" in my /etc/hosts file, except for the fact that DHCP changes it's address occasionally.I attempted changing the line

send host-name "<host-name>";
in /etc/dhcp3/dhclient.conf to
send host-name "file-server";

but to no avail.

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Ubuntu Networking :: Web Server Only Accessible By Local Network

Nov 3, 2010

I just setup a ubuntu 10.10 box learn linux and to play around with, and want it to host my website. I can see the web site on my local network no problem but the outside world gets a time out message. I check to make sure everything is forwarded correctly on my router and the dns so i has to be something in ubuntu blocking out-of-network traffic how do i turn port 80 on to the outside world

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Networking :: Com Port On Ubuntu Accessible To Remote Win Pc Via Network

Nov 4, 2010

I am trying to have a serial device connect to my ubuntu machine via the com port, and forward that comport over the network to a windows box so that I can configure/access the device. I have looked into socat/ sredird but still haven't found an option that I can get to work.

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Networking :: Creating Accessible Network Shares On (Fedora 15)?

Jun 29, 2011

Currently I am trying to get some fedora shares to simply connect to each other to access a read-only shared folder on a host machine (no security/encryption even required for these files!). I've tried to get a smb network share going but that didn't work (can't connect with nautilus), I've tried a quick fix with daap and rhythmbox so that they can at least access the music, but rhythmbox fails very miserably trying to connect/create that (and mt-daapd didn't help much) - Basically I get errors saying the host is unreachable.

I haven't even set up a firewall yet for this network and already I'm running into these fundamental problems. Currently I'm using Fedora 15. On a whim I tried the "public" folder and had sharing of the public folder over the network enabled - yep, didn't work (and I certainly didn't expect it to). I would be trying some more advanced CLI stuff, setting up an ssh server or something, but the computer-challenged people who have to access these files just want to be able to click something and have it work.For the operational requirements of this setup, a file synchronisation system would work (although highly inefficient since it would mean gigabytes sent over the network).

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CentOS 5 Networking :: Public Subnet Is Not Accessible From The Internal Network

Aug 6, 2010

I will try to explain a bit first about my network typology: I have one cent os 5.5 machine with 2 nics - external one 86.x.x.122 and internal one with 2 IPs: 192.168.1.1 and 89.x.x.121. The ideea is that I have a public subnet (86.x.x.120/29) of IPs which are routable only through 86.x.x.122 so I have a webserver hosted on a different machine with the IP of 89.x.x.122 and GW 89.x.x.121 - everything works perfectly fine, except that I cannot access from the internal network 192.168.1.0 / 24 the so called DMZ (roughly) - the 89.x.x.122.

What really makes me crazy is that I setup the IPtables rules correctly because I can access the webserver from the outside world but I cannot accessit from the internal network...

what I'm missing - why the 192.168.1.0/24 cannot see the 89.x.x.122 machine... What IPtables rules should I add?

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