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• Linux - Block ssh users from accessing other machines on the network

  - by Sam

  I have set up a virtual machine on my network for uni project development. I have 6 team members and I don't want them to SSH in and start sniffing my network traffic. I already have set the firewall on my W7 pcs to ignore any connection attempts from the Virtual Machine, but would like to go a step further and not allow any network access from the VM to other machines on my network. Team members will be access the VM by SSH. The only external port forwarded is to vm:22. The VM is running in VirtualBox on a bridged network connection. Running latest Debian. If someone could tell me how to do this I would be much obliged.

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• 3 Monitors 1 graphic card

  - by Michael

  I have a Nvidia GT 120 graphic card. It has a vga, dvi and hdmi output. Can I have 3 monitors with this? One for each port. Also if not, can I use dvi and hdmi and have 2 monitors. I know I can do 2 with the vga and dvi but I am wondering about dvi and hdmi. Also my last question is, if I can have 2 monitors with the dvi and hdmi, can I use a hdmi to dvi and still have the same success? Thanks

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• Proxychains tor + ssh tunnel

  - by linuxer

  Heelo, i have a problem with setting proxychains. I config file, when i set [ProxyList] # add proxy here ... # meanwile # defaults set to "tor" socks4 127.0.0.1 9050 It works well as tor, when i make an ssh tunnel on port 9051 and i use [ProxyList] # add proxy here ... # meanwile # defaults set to "tor" socks4 127.0.0.1 9051 It also works well with that ssh tunnel, but when i use this settings [ProxyList] # add proxy here ... # meanwile # defaults set to "tor" socks4 127.0.0.1 9050 socks4 127.0.0.1 9051 with both tor and ssh tunnel opened, it fails. Whats is wrong?

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• Has ec2 made self-hosting possible for 'amateur' sysadmins possible?

  - by Blankman

  I'm a developer, and it seems ec2 has made it possible for a amateur sysadmin like me to setup and maintain a fairly large set of servers. Now I don't mean to undermine real sys admins, as I know the value of them but what I am trying to get at is that someone like me can setup and maintain a cluster of servers (front end web servers, with some db servers) using tools like ec2 and capistrano with the help of google. Now this isn't something I would do as a long term thing, but as a startup, one-man operation, I think I can pull this off until business takes off and I can hire this important role out. With ec2, I get my firewall, so I basically open up port 80 on my public facing server, which will run haproxy and route requests to my cluster of servers. Ofcourse I am simplifying the setup, but just want a feel for what you guys think about my perception. My application is a web application, that will be runing Ruby on rails (passenger) and talking to mysql or postgresql.

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• Best practice for ONLY allowing MySQL access to a server?

  - by Calvin Froedge

  Here's the use case: I have a SaaS system that was built (dev environment) on a single box. I've moved everything to a cloud environment running Ubuntu 10.10. One server runs the application, the other runs the database. The basic idea is that the server that runs the database should only be accessible by the application and the administrator's machine, who both have correct RSA keys. My question: Would it be better practice to use a firewall to block access to ALL ports except MySQL, or skip firewall / iptables and just disable all other services / ports completely? Furthermore, should I run MySQL on a non-standard port? This database will hold quite sensitive information and I want to make sure I'm doing everything possible to properly safeguard it. Thanks in advance. I've been reading here for a while but this is the first question that I've asked. I'll try to answer some as well = )

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• USB connection issue

  - by user1664417

  Currently Im facing an issue when Im trying to connect any usb flash drive to my pc. ok, below is what happens to me: 1) I can connect usb keyboard and mouse without any issue. 2) however when i connect usb flash drive, there are 2 situations that are occuring randomly a) there is no usb drive mount in my computer, when device manager is checked, it shows error code 10, but is shown in disk management. b) my computer will have usb drive mounted, but when I click on it, it is empty. on right click the properties, the disk space show 0. (there are files within the usb) what i have done is: 1) run CCleaner to repair the registry, restart and try, but still not working. 2) uninstall the drive in device manager, restart and try, but still not working. 3) tried the port that connects mouse and keyboard, but does not work. anyone who experienced these problems before please guide me. any suggestions or solutions would be greatly appreciated. Thanks, Tony

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• Running a webserver behind a firewall, is it secure?

  - by i.am.intern

  Currently we have a Linux-based firewall which NAT-ing our public IP address to give internet access to our staff's PCs and a Windows Server 2003 for internal filesharing. I want to host Redmine/SVN (a bugtracker) internally behind this firewall using a Linux server. This webserver will be accessed by our clients externally so they can post bug reports. This means that I have to open port 80 & 22 at the firewall to give access to the webserver and me to SSH it from home. However, let's say I'm using password-based SSH for the webserver and somebody cracked it. Does that mean the cracker could ping and access other servers and PCs in the network?

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• how install minimum domain email piping to script in centos?

  - by Adam Ramadhan

  hello i have search google on a simple tutorial on how to make a piping email. first how does really email technically work? "stmp is a process that binds to 25, waiting for email request that goes in from another stmp process(in another server) determined by the domain MX route that will send the message to port 25 if any email goes though the MX.domain.tld" that is in a nutshell how emailing work, am i right? or there is something wrong here? second, so if im right, we need to set a SMTP server so we can receive incoming emails from MX SMTP route right? ive googled though google and found two best STMP servers from my opinion, they are EXIM and POSTFIX, can anybody give us a simple tutorial installing and setting up an email piping for a fresh installed linux/centos? example *.domain.tld -> allinonepipe.php thanks.

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• USB keyboard not recognized by motherboard with only a legacy PS/2 header

  - by Luis

  I've bought a D945GSEJT Atom motheboard that has three usb ports available and no PS/2 connector, just a PS/2 header. I have a PS/2 keyboard with a PS/2 to USB adapter and connected it to a USB port. I tried all three USB ports. The problem is that the board seems to not recognize my keyboard. None of the keys I press are detected by the system. I've read that maybe I could try to change BIOS USB settings to solve this detection problem. But how can I do it if I can't type anything? Is there any other option other than buying a PS/2 adapter and plug it to the PS/2 header?

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• I can't get my Macbook Pro to print to an IP addressable printer

  - by Pieter

  Running Macbook Pro OS X 10.6.3 Accessing an HP OfficeJet 5610 plugged in the USB port of a US Robotics router. I tried several combinations of: Protocol: Internet Printing Protocol (IPP) Line Printer Daemon (LPD) HP JetDirect (socket) Address: http://192.168.1.10:1631/printers/HP5610 192.168.1.10:1631/printers/HP5610 http://192.168.1.10:1631 192.168.1.10:1631 192.168.1.10 ... Driver: HP OfficeJet 5600 Series Whenever I try to print, it fails while saying "connected to printer" or "Printer is busy...zill try again in X seconds" Both Windows 7 and Windows XP computers on the network can successfully access this printer, identifying it as "HP5610 on http://192.168.1.10:1631/" I tried clearing all tasks and printers (ctrl-click in the menu), and resetting it to (socket, http://192.168.1.10:1631/printers/HP5610, HP5600 series) but to no success.

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• Node.js apps and wordpress on the same vps

  - by Msencenb

  So currently my linode (ubuntu 11.10) serves up three node.js apps for me using connect's vhost middleware listening on port 80. Here is an example of how vhost sets up a domain: var portfolio = require('./bootstrap-portfolio/lib/app.js'); var server = express(); server.use(express.vhost('sencedev.com',portfolio)); server.use(express.vhost('www.sencedev.com',portfolio)); server.listen(80); However I would now like to add a wordpress installation to my vps as well. In the past for me this has meant a traditional apache installation; however I'm a bit unsure of how node.js + a different webserver (apache or nginx) should interact. Any thoughts on how I should approach hosting wordpress + node.js on the same box?

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• How to slave a 3.5" 500gb sata external hdd(Western Digital) to my dell Inspiron laptop

  - by AJ HDD

  i have a 3.5" western digital my book 500gb external hdd....i gave it to a friend of mine and he broke the usb port in it...i went to a nearby comp repair shop and had him solder the thing...it didnt detect when i plugged it in my dell inspiron laptop........i recently saw about the 3.5" sata to usb enclosure, so i went to check it....strangely when its placed in the enclosure, its not detecting in windows...also when it was put as secondary(im guessing slave) to the shop fellow's desktop it shows up in the bios and starting, but then again doesnt show in windows 7, and the guy told me i need to data recovery to get teh data back p.s.the wd hdd doesnt have os, just data, soo my question is: can i slave the drive to my dell laptop and try to recover the data....if so how? please i would really appreciate it...thanks in advance

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• Using PVLANs with normal VLANs in a trunked environment

  - by user974896

  Assume a trunked environment with two switches, S1 and S2. The swtiches are connected with a trunk port designed to pass VLAN 26. What would happen if VLAN 26 on S2 is configured as a private-vlan with the default gateway and DHCP server and default gateway as promisc ports. What if S1's VLAN 26 is configured as a standard VLAN. Would the hosts on S1 be able to communicate with the promisc ports on S2? Would they be able to communicate with the hosts on S2? To further complicate things what if the DHCP server were to reside on S1 and I wanted S2 to have private VLANS with promisc ports as the gateway and DHCP server while still leaving S1 in a standard vlan configuration.

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• how to change the default open-with program to a program on the second disk

  - by Scott????

  I have a 250GB HDD for my system and a 60GB SSD using a SATA port. I installed most of my applications on the SSD. There's a strange thing though. I can not change the default open-with program to a program which is on the SSD. I think it may be caused by permission so I gave my user a 'full control' permission on the security tab in disk properties. But changing permissions is not work. After I choose an application (I've tried Notepad++, Sublime, 7Zip, etc.), nothing is added in the below window: Also, if I install 7Zip on my machine, the right click menu items can not be added.

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• Why does Pages.app connect to a server through https and keep the connection open?

  - by ggustafsson

  Every time i start up the program Pages (iWork) it connects to a server through https. What is going on? Why would Apple do this? I use no features under Pages that could warrant this behaviour. It connects to IP address 2.22.240.224 on port 443 and keeps the connection open until i close the application. All the info i can get from Wireshark is a bunch of Apple-related domain names. Edit: The same thing happens with Numbers. I have disabled "Documents & Data" on iCloud so that shouldn't be the reason why. Edit 2: The programs in the iWork suite stopped doing this after recent updates so it's not an issue anymore.

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• Anything to share a printer from 32-bit to 64-bit Windows?

  - by marklam

  I've got a printer which only has 32-bit drivers, so it's installed on a 32-bit machine (XP). I need it to appear as a printer (with duplex control etc) on a 64-bit machine (Vista). I can't just share it using Windows printer sharing because the 64-bit client requires drivers to connect to it. There's no 64-bit driver for a similar printer that works (using the new port named \\server\printername). I've tried the ghostscript approach but that doesn't seem to help with the duplex control etc. Printeranywhere doesn't support 64-bit OS yet. Is there another way to do this?

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• Is there a way to control two instantiated systemd services as a single unit?

  - by rascalking

  I've got a couple python web services I'm trying to run on a Fedora 15 box. They're being run by paster, and the only difference in starting them is the config file they read. This seems like a good fit for systemd's instantiated services, but I'd like to be able to control them as a single unit. A systemd target that requires both services seems like the way to approach that. Starting the target does start both services, but stopping the target leaves them running. Here's the service file: [Unit] Description=AUI Instance on Port %i After=syslog.target [Service] WorkingDirectory=/usr/local/share/aui ExecStart=/opt/cogo/bin/paster serve --log-file=/var/log/aui/%i deploy-%i.ini Restart=always RestartSec=2 User=aui Group=aui [Install] WantedBy=multi-user.target And here's the target file: [Unit] Description=AUI [email protected] [email protected] After=syslog.target [Install] WantedBy=multi-user.target Is this kind of grouping even possible with systemd?

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• How to Access an AWS Instance with RDC when behind a Private Subnet of a VPC

  - by dalej

  We are implementing a typical Amazon VPC with Public and Private Address - with all servers running the Windows platform. The MS SQL instances will be on the private subnet with all IIS/web servers on the public subnet. We have followed the detailed instructions at Scenario 2: VPC with Public and Private Subnets and everything works properly - until the point where you want to set up a Remote Desktop Connection into the SQL server(s) on the private subnet. At this point, the instructions assume you are accessing a server on the public subnet and it is not clear what is required to RDC to a server on a private subnet. It would make sense that some sort of port redirection is necessary - perhaps accessing the EIP of the Nat instance to hit a particular SQL server? Or perhaps use an Elastic Load Balancer (even though this is really for http protocols)? But it is not obvious what additional setup is required for such a Remote Desktop Connection?

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• Connecting to Windows 7 from fedora is slow

  - by user44212

  I use rdesktop command to connect to windows 7 machine remotely but I get a very slow reponse when I try and connent to it. The command that I used to connect to it is rdesktop -4 -C -x -b : -g 100% 192.168.1.100. I have tried using the rdesktop command to connect to the console port as well but the result is the same. I have even tried using the Terminal server client application the result is the same. I am trying to connect from fedora 14 machine to windows 7 professional is there any tweaking that needs to be done to overcome this issue either on fedora or Windows 7.

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• DVI-D Splitter Not Working with GeForce 8400gs

  - by jimdrang

  I have a GeForce 8400gs and it has a DVI and VGA port on the back. I was using dual monitors with one VGA and one DVI cable. I wanted both displays to be digital so I bought a DVI-D splitter and put one DVI cable in each monitor, connected them to the splitter and put the single merged connection in the back of the cards DVI connection. It will not recognize the second monitor (I'm not even sure how it determined which one was the first monitor). The tech specs state that it supports "Two dual-link DVI outputs for digital flat panel display resolutions up to 2560x1600" http://www.nvidia.com/object/geforce_8400_tech_specs.html. Do I need a different converter or is my only option for dual monitors with this card one VGA, one DVI?

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• When can an FTP server close its passive connections?

  - by Don Kirkby

  Does the FTP protocol allow the server to close any of its passive connections while the client is still connected? Can it tell when the client is finished receiving and then close the connection? I'm including an FTP server in my application using the pyftpdlib Python project. I've got it to work in active and passive mode, but I'm a bit concerned about when it closes its passive connections. I've tried connecting to it with both FileZilla and the default ftp command in Ubuntu, and in both cases, I get a new passive port for every request. That is, if I sit in the root folder and type ls 10 times, I use up 10 ports. This means that I have to allocate a big block of passive ports for the FTP server to use so it won't run out. As soon as the client disconnects, the server releases all the passive connections associated with that client and those ports can be reused. However, a long-running connection could use up a lot of ports.

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• Why doesn't my htaccess redirect work?

  - by cosmicbdog

  I have setup a simple htaccess redirect which looks like this (this is the whole .htaccess file): Options +FollowSymLinks RewriteEngine On Redirect 301 /something http://something.com/something.php If I then load the site which contains this .htaccess, ie, myredirectsite.com/something I end up with the following 404: The requested URL /something was not found on this server. Apache/2.2.3 (Red Hat) Server at myredirectsite.com Port 80 And the logs: [Tue Jul 10 14:25:46 2012] [error] [client xx.xx.xxx.xx] File does not exist: /home/sites/scp/something Something is not a file, and something does not exist. I have assumed I could use Redirect the same as a Rewrite but it looks like the redirect needs to be for a file that actually exists? I created the file 'something' and it just attempts to load the blank file. No redirect. What am I missing in getting this working?

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• Azure VM : Connection refused by host

  - by Simon Kérouack

  I recently stopped a subscription with 14 VMs in it and restarted it a few days later. Now all my VMs are working just fine at the exception of 6 used for MongoDB. They respond to ping and so they show as online in the azure dashboard but they do not answer to anything else. I tried (from different locations, in and out of the azure cloud) ssh : connect to host * port *: Connection refused telnet : Unable to connect to remote host: Connection refused mongo : exception: connect failed The ports for ssh and mongo are opened in azure. I tried restarting the VMs a few times trough the azure dashboard, they seem to restart successfully but still refuse all connections. I already looked for similar issues and the best solutions I found was to wait... the issue has been happening for 7 days and waiting is no more an option.

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• Is HDCP working for ATI/AMD cards on windows 8?

  - by Joel Barsotti

  I have an AMD 6950 and am running windows 8 RTM. I've tried the Catalyst 12.8 drivers and the 12.9 beta drivers. With either drive HDCP seems to be non operational. I've got two dell monitors, one a u2410 and the other a 2408wfp. Both were previously identified as supporting HDCP in windows 7 with the same hardware. I've tested the monitors individual on both DVI and display port, and neither one works. I'm using cyberlinks BD-Advisor to test. My end goal is getting the DirecTv2PC app working again, which is by cyberlink for DirecTV, and requires HDCP. Currently it shuts off when you start playing a recording.

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• embedded tomcat 7 behind iis 7.5 proxy ssl problems

  - by user1058410

  I'm using embedded tomcat 7 behind a iis 7.5 proxy server, with requests being forwarded to tomcat with arr. Everything works fine unless iis is set to require ssl. Then things like links that are generated dynamically in .jsp files on tomcat don't work right. For example if a link is supposed to point to _https://somewhere.com:443 it will be wrote as _http://somewhere.com:8080 (8080 is the port tomcat is running on). The problem seems to come from when tomcat looks at itself to build out the url it sees correctly that it is running on _http://somewhere.com:8080, but i need it to think otherwise. Does anybody know how to accomplish this without using ssl between iis and tomcat? Sorry for the underscores in front of the imaginary urls.

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